That is the question.
The hot tub be have(my current project) only came with four jets and a 1HP pump originally. I have a box with 6 jets and another 1.5 HP pump that I want to use on this tub. It is a kit for a bathtub that I bought to use when I was building the spa itself from scratch. I'm still not 100% on where I want the jets, but I have time to figure that out. The question is, can I just tape the inside of the shell and drill through it with a holesaw? The Spa is fiberglass, I think, if that's important.