I've been thinking about the seam sealer slow-drying issue with Rustoleum.
Has anyone used Tec7 sealant with Rustoleum? Very similar properties to Tigerseal but its apparently solvent free so in theory shouldn't effect the drying of Rustoleum...Might try it on my wheel rims...
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E D I T: test panel in progress of:
1 - CR4 pu sealer (solvent based, same as tigerseal) and
2 -Tec7 MS polymer (no solvent)
I smeared a layer of both on each end of a bit of metal and will let it cure for 24 hrs, then spray with rustoleum and see what happens!
Ok, so now the samples of sealant have been curing for about 19 hours or so. Both seem very similar in strength at this stage judging by prodding them with a fingernail. I painted on some unthinned white rustoleum this evening and will report back tomorrow...
Ok, so next morning the rustoleum on bare metal is touch dry, but is still very sticky on both types of seam sealer. Have left it sitting in the sunlight on a window sill for the day and will check back when I get home from work.
Righto, home now and its less than 24 hours after the rustoleum was painted on. It has dried to the touch now on top of the CR4 sealant, but on the Tec7 its still very sticky.
Very strange, its the opposite of what I thought would happen. Its drying faster on top of the sealer with solvent in it and slower on the sealer with no solvent.
Anyone care to explain that?!
Now 48 hrs since rustoleum applied. Still very sticky on the tec7.
Bone dry on the cr4.
E D I T: another week later and the rustoleum on the Tec7 is still sticky.
Conclusion: Tigerseal or CR4 is the way to go. Rustoleum won't dry quickly over Tec7 or brushable seam sealer. Not 100% sure what the problem was on my van when the rustoleum beaded off the CR4 sealant. Maybe the sealant acts as a dirt magnet and when the panel is being wiped all of the contamination ends up in the sealant. That's my best guess anyway.