I tend to use a decent amount of foam in my basing, either to build up areas before I add texture, or EPS insulation for large scenery pieces - or in this case, using extra hard foam cuttings for making to-scale wood planks.
In ay case, using any sort of aerosol or plastic cement will melt foam (I believe it's the xylene/toluene thinners in rattle can sprays that does that). This limits your options when priming foam and likewise limits your options when gluing plastic figures. As a planned workaround for future gluing, I inset cut sheet styrene pieces and built the rest of the base scenery around them - one problem solved!
But what about priming? An easy fix is to either seal the foam prior to any rattle-can spraying with watered-down wood glue (in the case of larger pieces of scenery), to just directly paint it (craft paints plus large foam scenery are a cheap alternative), in this example: to use a brush-on primer on the foam areas to seal those prior to using my regular rattle-can primer on the rest of the base. Problem #2 solved!
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