yeah, i'm definately going to do it with the boat upside down. I already have it flipped because i've been doing some more serious fiberglass repairs on th bottom of one of the hulls. I made the mistake of leaving the tape on until after the resin cured though. I spent days sanding back the layer that was over the tape to get the stuff off. Next time i'm using blue painter's tape so it doesn't leave sticky stuff, and I'm pulling it off as soon as the resin is tacky enough that it wont drip.