In the future put wax in the gel coat before using….You should be able to buy the wax additive where you bought the resin. If you can’t buy it ready made, find some plain gulf wax paraffin, shave up some of the wax and put it in a small glass jar…add just enough styrene to the wax to make it a liquid (you will have to stir it to help the paraffin completely dissolve). Add this wax/styrene mix to the resin after it is catalyzed (always put in any additive after catalyzing resin). I like to put in a bit more wax then recommended as it ensures a complete cure and easier sanding…many times the gel coat that has the wax added to it already, floats to the top of the can even when mixed well, when you use it... the first batch or two is alright, then the remaining resin is wax starved...Personaly I add a small amount of wax even to the products that claim to have it already added...I have had to deal with too many sticky finish coats.

Always use styrene to thin polyester resin not acetone. Wipe the old area with styrene in place of, or in addition to acetone... it tacks up the old material for a better bond.

Bob