I'm mid-resto right now and I have one bit of advice on power tools. This comes mainly from general experience, but a little bit from my boat project. DON'T USE YOUR NICE POWER TOOLS. Some say do, some say don't, but I can tell you that I will never buy an expensive grinder for this kind of work again. I had a really nice Milwaukee grinder that I bought new and used once to cut an exhaust tailpipe off. Used it on my boat to grind glass, knowing it would be bad but also not wanting to buy more tools. Trashed it before I even got the transom prepped. I got a $15 grinder from HF and I'm currently sitting here taking a break with one stringer left to go. If this grinder dies, I'll spend 10 minutes fitting before I realize I paid less for the grinder than I did the flap cups.
I also had a drill that I used during the teardown that got ruined by fiberglass dust. On top of that, every power tool I've used for a dirty job still smells of that job when I use it, to this day.
My recommendation is to buy cheap tools for this project and if they survive, use them for other dirty projects. In the scheme of a $1-3K repair, what's $15?