Re: Restoring 1987 Sea Sprite 4.3 175 19.5'
WELCOME TO IBOATS! You picked the right forum for advice on getting this boat back to safe and water ready. I dont have nearly the expierence as alot of the people of this site but everyones .02 is worth something. I'm sure one of the many experts will be through at some point to offer advice.
Going to put multiple coats to try and hide a bit more of the fiberglass look. Next on the list is patch the floor and frame for the interior.
Ron
These two sentences kinda worry me and most others i think. While I think you were on the right track with trying to degrease the bilge, I think a pass with a grinder and 40-60 grit discs would of given you the proper surface for the paint to bond. What type of paint did you use?
By patch, What exactly do you mean, Besides the obvious large hole caused by removing the tank. It was diffucult to tell in the picture but i did notice an area that may warrant a second look.

It appears that is the stringer and looks to be rotted, Big safety concern . Also in your 3rd picture it appears to be rotted wood. If that is the case it would be a good time to halt all progress and do some searching to see how far that rot goes.Any "soft/spongy" spots in deck? Also a good time to search Stringer/Transom replacement here on IBoats. If that is indeed rot all wood will need to be checked for rot including transom and removed as needed. Also the flotation foam if there is any will need checking for waterlogging. Core samples of the transom would be a good indication of the condition of the wood. Hope for the best and plan for the worst, but either way this is a great group of people that are willing to help with any advice provided you are willing to put in the time to make the needed repairs correctly to make the boat safe for you and anyone you may take out with you. Best of luck on this adventure.