19th Dec 2018, 08:58 AM
Covering foam with ... well what?
I'm working on a module right now that uses a fairly typical foam-on-plywood construction method. In the past I've used pink foam and coated it with "Foam Seal", a product I bought at a show. It's basically super-thick latex paint, similar to the paint you might use to seal a concrete wall in a basement. It's worked well for me, the modules have held up well.
For this module I did something different. I've used some of that expanding spray foam (long story, but it worked out well), but I can tell it's a bit "softer". I'm also low on the Foam Seal product. I started asking around at the train show and I found something I found surprising. Some of the guys put plaster over the foam. I would have thought that too fragile for a module, but it seems to be working for them.
I also have some "Flex Seal", liquid rubber in a can! Aside from the catchy infomercial it would provide a strong layer on top, but I think it would be kind of thick and maybe too flexible over time? Like the ground foam would be more apt to flake off if it expands and contracts.
Anyway, what do you do to seal/cover foam? Share your secrets!
19th Dec 2018, 09:11 AM