How do you Know which Topcoat Paint is Right for Your Boat - ALL AT SEA

The first coat of topside paint has been sprayed on. Notice the bottom and the deck are covered, but you can see overspray on both surfaces

How do you Know which Topcoat Paint is Right for Your Boat

The only real choice you had before getting your topside repainted was what color you liked. Now, the technologies are so complicated. Where to start?