Hi guys i made tons of stuff in wrapping and first time in my life i layed on fiberglass piece carbon then cutted around and brushed to lay second layer- by polyster resin. all time very EVEthing was good but not after 2 days its still not dry???? wtf i thought as other parts ive done never beeen to that AND WHAT IS INTERESTING YOU BRUSH WITH PAPER THAT NOT FULLY CURED SURFACE WITH BLADE AND THEN CAN BRUSH WITH PAPER BUT MOST INTERESTING IF PART WONT STICK TO YOUR HANDS AND YOU THINK ITS GOOD AND PUTTING IN TEMPERATURE LIKE 25 ITS STARTING TO COVERT INTO SAME LIKE BEFORE 5 MINUTES LAYED SURFACE .

Sounds like what happens when you try to rub it back before it has fully cured. I had the same issue with epoxy once, I got a little bit excited and tried to rub it back after only 12 hours curing. The surface was hard to the touch, but when I started rubbing it back it was very porous underneath the surface, made a huge mess. Left it to cure for the full 24 hours and it was fine, I could sand the porosity that I had caused out of it and it didn't occur anywhere else.