Thread: Brown mustache
View Single Post
Old 07-07-2016, 09:00 PM   #99
Capt.Bill11
Guru
 
Capt.Bill11's Avatar
 
City: Sarasota/Ft. Lauderdale
Join Date: Apr 2014
Posts: 5,438
The way I understand it is that tannin is released by organic matter in the water. It's the same stuff that gives your cup of tea it's "tea" color I believe.

It gives you the mustache effect because it sticks to gelcoat. I assume it sticks to gelcoat so well and not so well to two part poly paint becsuse the gelcoat surface is more porous than the paint surface.
Capt.Bill11 is offline   Reply With Quote