Fiber Glass resin problem

[SEmerson]

I fiberglassed a panel but the hardner wasn't mixed right. It will not harden. What is the best way to clean off the resin?

 

[Bertram65]

Not sure but try acetone, it will soften gelcoat and resin if allowed to sit on it for a while so it may remove/disolve resin that is not hardened. I would maybe wear a resporator as the fumes from mixing the two could be toxic.