I want to sand blast the underneath of my van.
I've seen sealey kits online for £30 are those types any good?
I have a 50ltr air compressor with this be big enough to use the the gun kit?
Also I've seen attachments for a pressure washer where it pumps up sand at the same time as blowing out water are these any good?
Has anyone sand blasted under their van at home?
Sand/wet blasting?
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CovKid
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Re: Sand/wet blasting?
Cripes, I wouldn't fancy it. It was bad enough with a micro blaster on outside seams. To lay underneath in a relatively confined space with all that stuff in the air doesn't bear thinking about.
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Cooper
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Re: Sand/wet blasting?
CovKid wrote:Cripes, I wouldn't fancy it. It was bad enough with a micro blaster on outside seams. To lay underneath in a relatively confined space with all that stuff in the air doesn't bear thinking about.
I could wear a mask
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ninja.turtle007
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Re: Sand/wet blasting?
The grit will get everywhere and those little blasters aren't very good. You would need an air fed mask and protection for a decent grit blaster.
You would be better off with a wire wheel and a lot of elbow grease.
Is yours really rusty underneath?
You would be better off with a wire wheel and a lot of elbow grease.
Is yours really rusty underneath?
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Cooper
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Re: Sand/wet blasting?
ninja.turtle007 wrote:The grit will get everywhere and those little blasters aren't very good. You would need an air fed mask and protection for a decent grit blaster.
You would be better off with a wire wheel and a lot of elbow grease.
Is yours really rusty underneath?
I've just looked up soda blasting and can make it for about £20.
Barcarbonate on soda instead of sand.
Works just aswell.
I'll let you know how it goes.
Not very rusty but want to get it all done.
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ninja.turtle007
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Re: Sand/wet blasting?
Cooper wrote:ninja.turtle007 wrote:The grit will get everywhere and those little blasters aren't very good. You would need an air fed mask and protection for a decent grit blaster.
You would be better off with a wire wheel and a lot of elbow grease.
Is yours really rusty underneath?
I've just looked up soda blasting and can make it for about £20.
Barcarbonate on soda instead of sand.
Works just aswell.
I'll let you know how it goes.
Not very rusty but want to get it all done.
Honestly you are wasting your time, I have seen the Youtube video too. You won't be able to breathe under you van and your eyes will be full of crap.
Soda blasting, grit blasting, plastic bead blasting will fill every nook and cranny with up. It will go everywhere!!
Give it a good jetwash, rake the inside of sills with a metal coat hanger and vacum them out. Use a wire wheel on a drill or grinder on the rust. Then use the Dinitrol kit.
On a different note, your delivery will arrive tomorrow and will require a signature.
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Mickyfin
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Re: Sand/wet blasting?
Have a look at my Flint thread to see what i have done to my Syncro underside. It's turned out quite well I think.
Owner of Flintstone, our T3/25 Caravelle C Syncro 1.9 Petrol.
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Cooper
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Re: Sand/wet blasting?
There are a lot of hard to reach places.
I am definatly going to get the din kit.
Cheers for that.
I am definatly going to get the din kit.Cheers for that.
Re: Sand/wet blasting?
i have blasted sections of my van underneath where it was stonechipped and had surface rust starting this was due to years of flying stones it now looks better than new , the blassting t was the easy part the hard part was removing years of dirt and the vw wax protection in all the crevices
Re: Sand/wet blasting?
Listen to what the other chaps are saying.
Do LOTS of research on it before committing to spending money.
Blasting absolutely hammers the compressor - i use a big shop compressor on an 40kg pot for soda to do remove sealer from seams/front lower panel and also do engine cases etc. You will need to run at 90/100psi - start doing sums and including cfm and nozzle size and you will see that a small domestic compressor wont hack it unless you run a 1/8" nozzle at lower (80) psi and even then probably will have to keep stopping to let the tank catch up. 1/8" nozzle to do a chassis will take you HOURS, like DAYS , you WILL lose the will to live.
Without even looking, no, the £30 kit wont work unless you really have lost the will to live.
There is little correleation between nozzle size/psi/cfm - its a VERY steep exponential curve.
To put it into perspective, a 1/8" nozzle will leave a pattern about the width of a cra7 marker pen- imagine colouring in your chassis by hand, on your back, with a 1000000db stereo in your ear while breathing pure dust/paint/underseal. One pass wont get the area clean with light/hobby kits. you will need to 'colour' in one spot a few times.
Bicarb will not remove rust, only very light scale/flaking stuff. Domestic compressor will take ages to get thr any underseal/seam sealer.
You cannot 'make' bicarb for blasting. you buy it 'as is'. Its VERY susceptible to moisture contamination. I use Armex which is £25/30 for 25kg. It has 'drying' agents to keep moisture at bay but leave it out/open for a while in it will still clog up from damp.
It will get EVERYWHERE so you must have understanding neighbours, its VERY noisy (compressed air being released at pressure), its very fine so you WILL need a very good mask/PPE etc etc.
Steer clear of wet blasting - water isnt good if you want to have a van with dry inner cills etc to wax/paint. Not suitable for your application. Also sand will damage rubber seals and if it gets in on any moving parts with oil/grease will make a really good grinding paste.
What CFM is your compressor? Post a link up of what kit you are looking at.
PLEASE PLEASE PLEASE PLEASE PLEASE do not buy anything until you have given this serious though. Potentially you are looking at £250 just to get started for pot/media/decent mask(non pressure fed) and even then it wont be up to it.
As has been said, consider other options
Do LOTS of research on it before committing to spending money.
Blasting absolutely hammers the compressor - i use a big shop compressor on an 40kg pot for soda to do remove sealer from seams/front lower panel and also do engine cases etc. You will need to run at 90/100psi - start doing sums and including cfm and nozzle size and you will see that a small domestic compressor wont hack it unless you run a 1/8" nozzle at lower (80) psi and even then probably will have to keep stopping to let the tank catch up. 1/8" nozzle to do a chassis will take you HOURS, like DAYS , you WILL lose the will to live.
Without even looking, no, the £30 kit wont work unless you really have lost the will to live.
There is little correleation between nozzle size/psi/cfm - its a VERY steep exponential curve.
To put it into perspective, a 1/8" nozzle will leave a pattern about the width of a cra7 marker pen- imagine colouring in your chassis by hand, on your back, with a 1000000db stereo in your ear while breathing pure dust/paint/underseal. One pass wont get the area clean with light/hobby kits. you will need to 'colour' in one spot a few times.
Bicarb will not remove rust, only very light scale/flaking stuff. Domestic compressor will take ages to get thr any underseal/seam sealer.
You cannot 'make' bicarb for blasting. you buy it 'as is'. Its VERY susceptible to moisture contamination. I use Armex which is £25/30 for 25kg. It has 'drying' agents to keep moisture at bay but leave it out/open for a while in it will still clog up from damp.
It will get EVERYWHERE so you must have understanding neighbours, its VERY noisy (compressed air being released at pressure), its very fine so you WILL need a very good mask/PPE etc etc.
Steer clear of wet blasting - water isnt good if you want to have a van with dry inner cills etc to wax/paint. Not suitable for your application. Also sand will damage rubber seals and if it gets in on any moving parts with oil/grease will make a really good grinding paste.
What CFM is your compressor? Post a link up of what kit you are looking at.
PLEASE PLEASE PLEASE PLEASE PLEASE do not buy anything until you have given this serious though. Potentially you are looking at £250 just to get started for pot/media/decent mask(non pressure fed) and even then it wont be up to it.
As has been said, consider other options
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Cooper
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Re: Sand/wet blasting?
I have 145psi compressor
I have ppe, air fed mask but I'm not going to bother with that.
I'll just uses my masks I use for chemical spraying and respraying cars.
I have fans, neighbour's don't mind I sprayed my mini in my garage before.
As for media things like the Ali oxide can warp the steel which I don't want so the bi carb I'm getting is far less damaging and the finish using some media makes the surface rough.
It's not a kit I'm getting it's bespoke.
I have ppe, air fed mask but I'm not going to bother with that.
I'll just uses my masks I use for chemical spraying and respraying cars.
I have fans, neighbour's don't mind I sprayed my mini in my garage before.
As for media things like the Ali oxide can warp the steel which I don't want so the bi carb I'm getting is far less damaging and the finish using some media makes the surface rough.
It's not a kit I'm getting it's bespoke.
Re: Sand/wet blasting?
145 psi?
To maintain 145psi thr a drinking straw requires less air than maintaining same thr a drain pipe. make sense?
What sort of CFM ? Psi dosnt really mean alot on its own. You have to consider the volume of air you are physically using (taking nozzle size into consideration). you will probably be aiming for 100psi ish for undeseal. To keep this sort of pressure you will have to have a compressor that puts out a large CFM OR restrict the volume used by using a small ( ie VERY small ) nozzle.
If your receiver is only 50l i am guessing it is relatively low CFM ( any largish 'shop' compressor will have half decent sized receiver as well).
You dont want to be using fans unless you have somewhere to collect it in a proper extractor. a couple of kg of soda will easily cover a garage floor to make it look as if its been lightly snowing.
Blasting is different to spraying. as well as compressor noise you have the sound of 100psi of air being released thr a relatively low size opening. it is very noisy.
No media will warp steel if used correctly by an experienced operative.
Post the details of your compressor plate up or make and model.
Just to reiterate, to do the job properly you will need to spend about 6k on a pot and compressor large enough to support it.................................
To maintain 145psi thr a drinking straw requires less air than maintaining same thr a drain pipe. make sense?
What sort of CFM ? Psi dosnt really mean alot on its own. You have to consider the volume of air you are physically using (taking nozzle size into consideration). you will probably be aiming for 100psi ish for undeseal. To keep this sort of pressure you will have to have a compressor that puts out a large CFM OR restrict the volume used by using a small ( ie VERY small ) nozzle.
If your receiver is only 50l i am guessing it is relatively low CFM ( any largish 'shop' compressor will have half decent sized receiver as well).
You dont want to be using fans unless you have somewhere to collect it in a proper extractor. a couple of kg of soda will easily cover a garage floor to make it look as if its been lightly snowing.
Blasting is different to spraying. as well as compressor noise you have the sound of 100psi of air being released thr a relatively low size opening. it is very noisy.
No media will warp steel if used correctly by an experienced operative.
Post the details of your compressor plate up or make and model.
Just to reiterate, to do the job properly you will need to spend about 6k on a pot and compressor large enough to support it.................................
Re: Sand/wet blasting?
Cooper wrote: I have ppe, air fed mask but I'm not going to bother with that.
I'll just uses my masks I use for chemical spraying and respraying cars.
.
under a van? how many microns are the filters rated at? how long do you think before they become fully clogged? soda is relatively big particles compared to solvent/paint vapour but small enough to stay airborn for some time and hang in the air. give you ten minutes before you find filters are cloppered
linky to bespoke kit please
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Cooper
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Re: Sand/wet blasting?
I think it's 7.3 cfm.
The nozzle is about 4mm but that's just for the small areas.
Like I said I'm not doing the whole of the underneath.
I'll let you know about the microns.
The nozzle is about 4mm but that's just for the small areas.
Like I said I'm not doing the whole of the underneath.
I'll let you know about the microns.
Re: Sand/wet blasting?
microns thing was kind of rhetorical. Point is it will be clogged very quickly as its not fit for purpose.
plenty of info on net, heres a few i found in seconds
http://surfacefinishingcompany.com/site ... Tables.pdf" onclick="window.open(this.href);return false;
http://www.blastitclean.co.uk/page6a.html" onclick="window.open(this.href);return false;
http://www.centurywise.co.uk/content/pd ... eaning.PDF" onclick="window.open(this.href);return false;
7.3cfm@100psi on a 4mm nozzle using 50l receiver = receiver empty in a nano second, compressor running continuously, having to blast for 1 second then wait for 3 years to get pressure back up before repeating cycle continuously until your 132nd birthday just to do one cill. (but compressor will die within a few hours of starting so reaching your 132 birthday is purely theoretical!)
PLEASE PLEASE PLEASE PLEASE PLEASE DONT DO IT. You are wasting your money.
plenty of info on net, heres a few i found in seconds
http://surfacefinishingcompany.com/site ... Tables.pdf" onclick="window.open(this.href);return false;
http://www.blastitclean.co.uk/page6a.html" onclick="window.open(this.href);return false;
http://www.centurywise.co.uk/content/pd ... eaning.PDF" onclick="window.open(this.href);return false;
7.3cfm@100psi on a 4mm nozzle using 50l receiver = receiver empty in a nano second, compressor running continuously, having to blast for 1 second then wait for 3 years to get pressure back up before repeating cycle continuously until your 132nd birthday just to do one cill. (but compressor will die within a few hours of starting so reaching your 132 birthday is purely theoretical!)
PLEASE PLEASE PLEASE PLEASE PLEASE DONT DO IT. You are wasting your money.