Originally Posted by seasick
Much of the FG resins used in the early 70s have exhibited little or no inclination to allow for water absorption. If it ain't broke why in the world do you want to fix it? There must be other great projects on your boat on which to throw your time and money
I was corrected on this some time ago, here on this forum.
boats in Lake Ontario
, and I advise that if a boat was manufactured after 1995 (after widespread use of vinylester), osmosis prevention is not likely required. Additionally, if it was manufactured before 1995, and it is not showing any sign of osmosis now, it is not likely to be seriously affected in future.
EXCEPT, when taking a northern cool fresh water boat (e.g. Lake Ontario) into southern warm salt water
, where some boats have been suddenly afflicted with severe pox, where none were before).
Now, if one is getting there bottom stripped, it is wise to apply a coat of primer (e.g. Interlux 2000E) before the new anti-fouling
. If at the same time, one wishes a barrier coat (3 more coats of Interlux 2000E) the incremental cost is minimal, so why not?
Everything else being equal, a severe blisters
(even small non-osmotic blisters) will knock about 15% off the boat value. A boat with a top condition bottom, will add about 10%.
For most boats, the value gain vs cost is in favour of the owner, (even when completely hired out at full yard rate.)
Putting a good bottom on, is actually one of the better boat investments one can make.
Disclosure: I sell and apply marine
finishes professionally. This post is offered as free friendly advice and not intended to solicit business.