Originally Posted by
stevieturbo
I think it is correct to use seam sealer before painting. It adheres better to bare metal.
Might also be worth heating the metal first, to try and ensure no moisture or damp whatsoever is in there before it's sealed.
The sealer will adhere to etch just as good as on bare metal. Plus it's offers extra protection. If you get an air bubble/pin hole in the sealer without the etch you'll end up with trapped water attacking bare metal.