Craig,
If you tried your resin/paint/coat on blue or pink foam if it is harmful, or not,
if not harmful, please, let us know its brandname.
It would be common interest, since I can advise only the CIBA/Huntsman Araldite LY-5052 with its hardener.
It is coming from the aerospace industry, pretty expensive, and I am not sure, if it is obtainable in small quantities.
Istvan