Chemical Metal - windscreen rust

[Flyingchunk]

Hi all, second question....

I've bought a new window rubber for my t25 as it has the common problem of leaking in the corners and the start of some rust.

I understand removing the old rubbers and screen may reveal some unknown horrors.

Most on here seem to repair bad corrosion by welding in new metal. However others on other forums have used "chemical metal".

Now I'm all for giving welding a go, however chemical metal looks a lot less hassle. You can also use to reface heads etc etc.

My question is.... Why WOULDN'T you use it on this repair, or any repair in general?

May be a silly question, but this stuff looks as strong as anything you'd weld in as people mend their blocks and all sorts with it.

Cheers in advance

[Doogs]

If you apply it over rust you'll only hide the problem (for a short time) not fix it

[Flyingchunk]

Sorry, maybe I wasn't clear. Not putting over, but removing the old rust and just building a new bit with the chemical metal.

Admittedly, I realise this has to be a rather small bit.

[Plasticman]

put up a link to the specific product
please
mm

[boatbuilder]

Chemical metal is basically a very strong type of epoxy as far as I know. For patching a bit of sheet metal though, I can't imagine it being very good, as I can envisage being able to just pop the patch out if it was poked with your finger. If you used a bit of fibreglass underneath to stop the whole lot from falling out, it should be ok.
Although it would be really important that not even a speck of rust was left.

[Plasticman]

agreed, its posh filler, ive been using it for 30 + years but not for that application, it does have its uses though
mm

[Flyingchunk]

Here's the thread on pistonheads where the guy uses it on his windscreen surround.

It's a great read anyway and a wonderful story......

http://www.pistonheads.com/gassing/topi ... 3&d=0&nmt=

Do you not think it's the right way to use it then?

It's just it would be easier and quicker for me to crack on using the stuff and sand and shape it than finding welding gear and cutting out the old stuff. Not being lazy just want the screen in and out and sorted pronto.

[jimpainter]

Looking at that thread he has only used the chemical metal to repair a small section of the flange.
You will find when you remove the screen (if you can see rust already) that you will need to remake the whole flange around the corners and more than likly you will have holes around the corners as well.
Best bet is to organise someone with a welder to do the job right when the screen is out. Should only be a couple of hours work to put right provided it hasn't eaten into the metal under the dash etc.
Jim

[Flyingchunk]

Ok. Fair play.

I've seen some mobile welders in the local rag so could give them a buzz to come see.

Fingers crossed its not too bad when the screen is out. I'll post some pics on here no doubt