Cabinet scrapers can be found on Amazon, search Crown 376 cabinet scraper and that should produce a set for $16 that has a bunch of shapes. If HD is going to have them it should be in hand tools but I have never looked there.. I got a set from Woodcraft.com, same as the Amazon set... You can also make them out of used up saw blades but it takes a little time.
If you search here for "new gel coat compound" there are a few threads that deal with how to get the best shine on the hull..
Good luck!