recently i just purchased a 1977 sea ray 21 foot boat.... i love the boat, except for the ugly yellowish brown color the hull is..... ive been searching the forums for different tips.... the hull is in great condition and the current paint/ gel coat looks prety decent for being 30 yrs old.... my question is, could i just sand it with like 120 grit and paint it.... im not looking for a great finish, i just want to paint it all white with a blue stripe around it.... whats a decent paint to use, thats not overly expensive.... do i need to do anything else to it besides sanding it? any help is greatly appriciated, i am new to the boating expierence 