First large job, a few questions

[Jomax]

I'm reading a ton on gel coat. If you want a flawless finish, you must wet sand. M105/205 works excellent after wet sanding

[Frenchie]

for the inside, I used my APC of choice....kind of a custom mixture if you will, and a scotch brite.....and lots of elbow grease...For the hard to reach areas I used a Black and Decker Mouse with the wull pad on the bottom(I use this alot on vinyl surfaces such as the insides of a boat) The only spots that would not come out of the interior were around the battery tray and turns out, that the owner is replacing that carpet anyways.