Here's how I would do it on a jet ski:
Get the biggest drill you can find. Get the biggest drill bit you can find. Drill as many holes as possible in bottom of said Jet ski to get rid of gelcoat an fiberglass together. Place in water. Watch it sink.
You could alternately use some C4 or other explosive, but that might get a little messy.
Best advice yet! Or leave it purple...kind of fits Karl's motif. Better yet, he should sell that purple thing back to the woman he bought it from.
E,
Anything from about 1.5 to 3 will work. Depends how thick you want it, and how much patience you have to get it that thick.
1.8 is good for small repairs.
