I’m doing my first cutlap. If it’s around 70 degrees & low humidity, how long before I can flip the board and razor blade my line? I’ve watched a lot of YouTube on this, but I need an idea of the schedule i.e., how many hours, maybe 1 hour, 2… I don’t know. This is polyester, NOT epoxy. I do most of my work in the evenings, and I don’t think I can go to bed and cut the lap in the morning. It would be hard by then right?
A zpper cuts needs the lap to be 80-90% cured, so you are looking at 3-4 hours, But maybe less if it’s warmer, and drier.
Or…you can flip the board in 30-45 minutes and cut the lap along the tape line. If done with a steady hand, it can look as good as the zipper cut. Just make sure you ahve wax paper on the racks for the deck side to sit on.
This is assuming you are using 1% catalyst and not taking too long to laminate.
Also, Do not let the resin once catalysed sit in the pot, get it on the board as quick as possible.