Great primer to use on foam! It’s an amazing tool to have in your toolbox for terrain making. I used the dungeon and sub terrain colour to paint a portal made of carved XPS foam. I didn’t have to coat it to stop the spray from melting so it retained all the carving details and saved me tons of time. The matt sealer also works great for sealing foam and giving a nice protective topcoat. I tried it on foam core, wood and cork and all had great coverage. As with all spray paints, make sure to shake well, keep the can warm and clear your nozzles after use and you shouldn’t have any issues.