You do not need much time at 60 deg .. The unimoulds I have made were probably at 60 degrees for less than an hour ..

"Sapere Aude"... Dare to KNOW!

The written word is the only truly efficient vehicle for transmitting a complex concept from mind to mind...

103% of all people do not understand statistics...

Do not adjust our mind, theres a fault in reality :-)

I only got 2 layers on as there wouldn't of been enough resin to complete the third layer, so stopped at 2 layers. That's what I worry about now is the self bake. How long for a 60° bake? I should be able to do this

How many layers did you get down? You can apply more layers within a 24 hour time frame, though I would scuff up the surface with 60 grit paper and clean well with acetone regardless. If longer than 24 hours, make sure you scuff up and clean. 

I've miss calculated the amount of resin needed for my mould and haven't achieved 4 layers, is there still an option of applying more within a time frame? or is it best to wait and key in and add more??