I making a diorama and using some blue foam as its base(25 mm).

I want to put it on a wooden decorative base like a plaque or plark.

Can the blue foam be PVA glued to the wooden base or would i need some plastic card underneath the foam first and then PVA the plastic card to the wooden base.

Basicly i want to know what will make the diorama more structualy sound and strong.

So plastic card needed ? or just the blue foam over the wooden base ?

thankyou

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I have my issues with GW but in the end, secretly, I am a GW fanatic.

PVA glue does not hurt the foam, use it

It may cause some warping as it dries though, best to weight the whole thing down real well until the glue is thoroughly dry.

PVA needs air to dry, so it will take a while for it to set properly. But it works perfectly well and will form a strong bond eventually.

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Dagster

You might want to look for a product called Liquid Nails for small projects. Contractors can't wait for white glue to dry so they use special nail guns or Liquid nails in caulk guns to hang insulation foam.

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"the same as a duck you must be made of wood"

Of course, it will be perfect if you give it time to dry...

Ok, cool, thank you all very much.

(gee this forum is super helpful )

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I have my issues with GW but in the end, secretly, I am a GW fanatic.

There is also a product called 'No More Nails' by Lepage, same stuff. It's really hard to not get it glued down with this stuff but it costs much more than PVA glue. Good for first timer though and also perfect for sealing/strengthening the ends and edges.

You can glue it straight to the wood. Just roughen up the wood and foam with sand paper then spread adhesive evenly on wood. Put on the foam and give it a twist when putting it on so its snug. Set weight evenly on top of foam and let it set for 24 hours with No More Nails or 2-3 days with glue.

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http://drinkingwotr.blogspot.com/ - Links to my CrAzY House Rules, Games and 'poor man's' terrain.

I've had problems with Liquid Nails and styrofoam - it stops sticking after a while and comes apart. So I don't use it anymore and stick to PVA (sorry, bad pun).

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Dagster

That is interesting. I have had a different experience with Liquid Nails. I can't get the (expletive deleted) stuff off plywood.The Styrofoam is not strong enough to resist much force so it breaks off the glue. The glue however is very difficult to remove from salvaged plywood. At least you can sand PVA down if the Styrofoam breaks off the glue.
If you properly clamp and press Styrofoam to plywood with PVA or Liquid Nails you will not get it off in one piece.
I think the PVA ( a carpenters brand not school glue) would create a stronger bond if it is pressed and clamped because the PVA will find its way into the porous Styrofoam and grip better. The Styrofoam products sold for home insulation have a vapor barrier that might prevent PVA from bonding at all.Remove it and ruff up the surface before you glue and clamp. It will take a week to cure. If it is a small piece It might be ok after a few days.

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"the same as a duck you must be made of wood"