How is the weather? is it raining? too cold?
Be careful about heating it, it may shrink the PS. I´m having similar problems with a PS model that I´m building right now, it´s a 1:8 scale model, and it´s taking so much time to dry due to the weather.
Best regards
JELP
Was mixed 2:1 as stated on the mix
Ok my guys who are covering the polystyrene in epoxy are saying its taking over a day to dry. Is that correct ?
Did you use hardner?
Heat lamp might get it to kick if you mixed it properly.