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I used Liquid Nails Latex Adhesive For Foamboard & Projects, Product Number LN-604, to fasten foam down to an unpainted plywood base for a 6' x 9' layout about 2 years ago. I let it dry with weight on the surface for about 3 days and everything seemed to be good and tight. I then applied foam Track-Bed on top of the foam and laid flex-track on top of that. Everything worked fairly well for almost two years, but last Saturday I noticed that the foam board was separating from the plywood in a big way. <br />To heck with foam board. I'm going back to the old fashioned open grid with wooden sub-roadbed on wooden risers with screws and wood glue !!!
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