Gluing Craft Foam Sheets

[freescopesdad]

I'll be using 1mm and 2mm craft foam sheets for roads and pavement in a layout expansion (sawmill complex and small rural town). What is the best adhesive for attaching the foam sheets to a pink foam base? Thanks.

[TrainCat2]

Scotch Photo Mount Spray Adhesive

https://www.amazon.com/Scotch-Photo-Photo-safe-Adhesive-6094/dp/B0009GXMJG

[garethashenden]

I like this stuff for gluing foam https://hotwirefoamfactory.com/-028SG--StyroGoo-.html

[freescopesdad]

With regard to Styrogoo... Do you apply it in a bead like caulk or spread it over the entire surface area?

[garethashenden]

More as a bead, but I'll usually wiggle the two pieces as I put them together to spread it out.

[freescopesdad]

Just got a reply from the manufacturer who said to spread it. Maybe I'll try the spray glue first on some test material. My concern would be an air pocket or raised area if the glue was beaded. What about straight white glue brushed on and smoothed with a 2" paint roller?

[MK]

Why not a spray like what Bob mentioned above?  Nice even coat and you won't have uncoated pockets which can expand/contract causing bumps.

[garethashenden]

Just got a reply from the manufacturer who said to spread it. Maybe I'll try the spray glue first on some test material. My concern would be an air pocket or raised area if the glue was beaded. What about straight white glue brushed on and smoothed with a 2" paint roller?

White glue needs air to cure. If its trapped between two layers of foam it won't cure. Or at least not in the timeframe you expect.

[MK]

Yep!  Years and years ago, when I started using foam as a base instead of wood, I used carpenter's or yellow glue.  After days it was still wet between the sheets!

[Mdrzycimski]

The OP was talking about craft foam sheets.  I assume these are the Eva type foam sheets.  Aren’t they somewhat porous and would allow white glue to cure?

[peteski]

The OP was talking about craft foam sheets.  I assume these are the Eva type foam sheets.  Aren’t they somewhat porous and would allow white glue to cure?

EVA foam (at least the type I have dealt with) is porous, but it is a closed-cell type of foam.  That means it is water and air tight, so any water-based glue will not be able to dry by water evaporation.

https://evafoam.cc/what-is-eva-foam-a-comprehensive-guide-to-its-uses-and-benefits/