I had to make a few tiny repairs to my mould and mixed up such a small quantity of gelcoat I couldn't measure it properly. Mixing it 10:1 I had about 7-8gr of gelcoat and I added a bit of hardener that was less than 1gr, but I'm not sure by how much. I just had a look at the gelcoat 18hrs later and part of it is hard but some of it feels a bit greasy and smears a little on to my finger when rubbed. Will it harden out eventually and if so how long could it take?