What can I use to seal and harden pink foam?

[RadioactiveMicrobe]

Yeah, what the title said.

 

[LoneHowler]

I think any of the traditional resins are a no go since it will melt the foam the same way it destroys styrofoam cups.
Perhaps some sort of glue?

 

[Zero Prime]

Personaly i used Plasti-Dip that i got from my local Ace Hardware

 

[Hyperballistik]

I know back in the day I used to put together Foam Remote control airplanes and we couldn't paint them with spray paint because it would melt the foam, so to combat that we used to water down elmers white glue and paint on several coats of the mixture on the foam something like 5 or 6 good coats after it was all dried you could paint it without melting the foam, im pretty sure this method would work with the Resin also, you could always test this out on some scrap foam and see if it works

 

[RadioactiveMicrobe]

Personaly i used Plasti-Dip that i got from my local Ace Hardware

Is plastidip sandable?

 

[Unity]

Is plastidip sandable?

It is just a rubber coating . So , No . It's not sandable :/

 

[SpartanRogue1]

I know back in the day I used to put together Foam Remote control airplanes and we couldn't paint them with spray paint because it would melt the foam, so to combat that we used to water down elmers white glue and paint on several coats of the mixture on the foam something like 5 or 6 good coats after it was all dried you could paint it without melting the foam, im pretty sure this method would work with the Resin also, you could always test this out on some scrap foam and see if it works

To expand a bit, if you want to seal it, you could also try Modge Podge. It's pretty much an already watered down Elmers glue, but specifically made for sealing paper and stuff, so I'm guessing it would probably work on foam as well. I'm not sure if you would be able to resin over it, but at least you'd be able to spray paint it. Not sure if that helps, but just throwing my $0.02 out there.

 

[Arioch]

I use Clear Seal, by Liquid Nails. You can get it at WalMart. Its pretty cheap, you wipe it on with a bondo spreader, let it dry and paint it. Its rubbery so you cant sand it, but its great for paint and filling gaps.

 

[RadioactiveMicrobe]

I use Clear Seal, by Liquid Nails. You can get it at WalMart. Its pretty cheap, you wipe it on with a bondo spreader, let it dry and paint it. Its rubbery so you cant sand it, but its great for paint and filling gaps.

How well does it cover up mishaps like a small crack on the foam?

 

[ShadoKat]

"Pink foam acts badly when exposed to polyester resins (bondo, fiberglass, etc) so it was sealed with a few coats of urethane casting resin. This gives me a tough, lightweight shell to work on top of without worrying about it dissolving the foam base."

source: http://volpinprops.blogspot.com/2011/02/daft-punk-helmet-thomas-part-1.html

 

[dung0beetle]

Watered down white glue is the cheap way to go, but it works. It isn't sandable, but you can resin it...the resin is sandable.

 

[RadioactiveMicrobe]

"Pink foam acts badly when exposed to polyester resins (bondo, fiberglass, etc) so it was sealed with a few coats of urethane casting resin. This gives me a tough, lightweight shell to work on top of without worrying about it dissolving the foam base."

source: http://volpinprops.blogspot.com/2011/02/daft-punk-helmet-thomas-part-1.html

Oh, cool. I have some Smooth-cast in my closet. That should do it?