|Topic Review (Newest First)|
|06-25-2009 12:22 PM|
|Bene505||Why be as good to your boat as possible, since you have stripped now? (It maybe the last time is it ever in that state.) Go with several coats of Interlux 2000e (barrier coat) and then ablative paint. Follow the timings that are required.|
|06-25-2009 12:13 PM|
Whatever you do, you cannot completely protect fiberglass. Whtever you apply will cause water to penetrte to it. Gellcoat is permeable to some extent, Epoxy is better but not waterproof. For blistering not only water but some chemicals are also needed. They are generally present in the plastic of the hull. It depends on their quantity to bond with water and form blisters. That means osmosis is not the real reasonof blisters but the chemica reaction with water and the chemicals inside the fiberglass.
The amount of water in the hull is not as much as it is thought. A dry hull has a maximum of 1 - 1,2 % water in its content. The maximum is something like 3%, which means the boat will be heavier maximum 3% of its hull weight.
|06-25-2009 11:53 AM|
Originally Posted by badsanta View Post
OR IS IT? I assume many boats without barrier coats live for years in locales like Florida without blistering...but what do I know, I live in new England. Can any Florida posters clarify whether blistering in a year-round-environment is a common exception, or a rule?
|06-25-2009 11:35 AM|
|badsanta||It is my understanding that all fiber glass boats absorb water and if left in the water for years it can add hundreds or thousands of pounds of weight to the boat. I always thought the barrier coat was to prevent this. iirc|
|06-25-2009 08:54 AM|
Originally Posted by DropTop View Post
|06-24-2009 10:10 PM|
a friend of mine (in the process of doing the exact same thing on his Catalina 25) called Interlux today and they told him not to use any barrier or primer, go straight paint....
seems like I'm probably not going to get a concensus on what is the reccomended way after all... (Gary, I agree with your logic, I only question if it actually makes a difference, or it's just peice of mind)
|06-24-2009 10:33 AM|
|Gary3675||Barrier-coating ....we put 8 coats on...the more the better. 8 years later the bottom was perfect......|
|06-24-2009 10:13 AM|
As you can see, everyone has a different opinion. Let's try this another way:
Safest approach - barrier coat and then paint
Expedient approach - just bottom paint
Strange approach - regular primer paint and then bottom paint.
|06-24-2009 10:02 AM|
Given the boat has no blistering, if you are going to use it in the same manner that it has been used in the prior 19 years (same water, same season length), then I would not bother with barrier-coating (which is 4-5 coats at least).
I would proceed with recommendation 3, be sure to follow the paint prep instructions, including sanding the bottom with 80 grit paper first.
|06-24-2009 08:00 AM|
|celenoglu||In my opinion the boat is old enough to develope osmosis. If it didnot develope osmosis till now, it is less likely to develope it from now on. To simplify things I can say that the gell coat made its duty to protect the boat. Just apply your antifouling.|
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