I recently aquired a 72 sunfish from a friend . I hope to give it to my 12 yo son who has fallen in love with sailing. The problems are a wet hull from being in the weather untouched and filling with water, a damaged rudder, and a hull with multiple gel coat spirals and dings and probably some leaks. The good is a sail that appears nearly new, a good daggerboard and all other parts. What would be the most economical way to repair hull and deck to a presentable water tight finish where he could pursue his appetite for sailing. Are there any paint type sealants you can spray on to have a shiny seaworthy boat short of a new gel coat. I am obviously a novice and appeciate any advice. Thanks , Brett