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Is it a small mould, are you wasting much gelcoat if you start again? It is better to start again, so if you're only wasting a little bit then that is what I would do.
If it is a large mould and you can't stomach throwing the gelcoat, you can get away with scuffing the gelcoat up with some 80 grit. You need to be very careful to not pre-release the gelcoat, which will happen quite easily when using Easylease, so just use minimal pressure. Be sure to sand the surface well, but obviously don't go through to the pattern underneath!
This is not as good as the chemical bond you would get with proceeding at the tacky stage, but will give you a useable mould if you are only wanting a small production run.
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