Jim, In 1987 when my boat was new, I applied the requisite number of coats of 'Interprotect' to the hull before her first launch. It had many blisters the first year and was completely covered with in another couple of years. Interlux offered nothing. Advice from a knowledgeable individual at one the major epoxy manufacturers was to wait until the blisters were fully developed (I think I waited four years) then peel the bottom, including the first mat layer. This gentleman said he used vinyl ester on his 50 footer and suggested I do the same. I then did a rebuild myself using vinyl ester resin. I haven't had a blister since. In my estimation, VE is a much better barrier to water than is epoxy. Back to your question about drying times, I peeled mine in the fall, and allowed it to air dry over a typical northern Maryland winter. Except for one two square foot area it was dry enough to rebuild when the temperatures were warm enough to work the resin. I accelerated the drying of the one wet spot by using a combination of heat lamps and vacuum bagging. By the way, I posted to the list on this subject some years back and several people replied off list that they had the same blister problem I had following application of the Interprotect. Bob Kassal Chateau de Mer Marathon