WRFB was taken from box with no pre-sanding or other treatment used. Paint used was Krylon ColorMaxx Sun Yellow and Krylon All Purpose Bonding Primer Flat White. I used "Duck Tape's" new reinforced clear packing tape (it is really sticky). Sprayed test panels. 24 hours performed tape test (left hand side of panels)
48 hours, same test (right hand side). Advice; Let it dry. Note, on the yellow panel it appears blistered this the result of spaying to heavy of coat. The yellow paint did not coat well and was "Splotchy", to counter this more paint was applied. Thus, the paint penetrated the paper and attacked the foam, it did not seem to affect the foam to paper bond. On the next panel I used Krylon's flat white primer. It has excellent coating properties (more pigment I assume). The 48 hour tape test was used again with the same results as the yellow panel, without the "Splotchy" problem. On a new project I used the primer and followed with a gloss paint coating, very pleased. You should seal your boards exposed edges as these paints are not foam safe. I noted, different types of tape can give different results, but if you let your paint dry enough the problem usually goes away. I have not done any testing on other paint brands, so you'll have to evaluated them for yourself.