Bottom paint

[Golf Ranger]

I’m looking to move from fresh to saltwater this fall. Will sanding the bottom void any warranty?

 

[Submariner]

I’m looking to move from fresh to saltwater this fall. Will sanding the bottom void any warranty?

To bottom paint the boat correctly, it's required that the bottom be completely sanded. Bottom paint won't stick very well to smooth gelcoat.

Here's a video of what happened to a boat I know, that had bottom paint applied to a brand new boat, with zero prep work on the hull.

Bottom Paint Fail

Here's the correct way to bottom paint a boat.
Avoid Costly Mistakes: The Correct Way to Apply Bottom Paint on your Boat.