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Go Back   SailNet Community > On Board > Gear & Maintenance > Bottom paint
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Thread: Bottom paint Reply to Thread
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Topic Review (Newest First)
08-17-2014 09:33 PM
TQA
Re: Bottom paint

Quote:
Originally Posted by ianjoub View Post
Yes, I am not at a marina. I have the boat at my auto repair shop.

Should I put the outdoor oil based primer and top coat on top of the barrier coat, or instead of the barrier coat?
Instead.

An epoxy barrier coat will do just fine on it's own.

Something like Sherwin Williamss Fast Clad® Brush Grade Epoxy.
08-17-2014 05:48 PM
Tempest
Re: Bottom paint

Cincy...There's a lot of information regarding this multi-step process on the Boat US Website:
There are also the paint manufacturers sites: like Petit and Interlux; take some time and check them out.

This is just one article: Boat Bottom Paint - BoatTECH - BoatUS

To briefly answer your question yes..you should sand the bottom to remove any peeling or chipping paint, but you want to be careful not to go so far that you damage the gel coat if it's still intact.

Barrier coat's goal is to keep moisture out, but it can also trap moisture in. So the hull should be clean and dry. Bottom paint is used to prevent marine growth, however it is not impervious and will allow moisture in. So, it's often desirable to barrier coat and then apply bottom paint. Then you maintain the bottom paint.

This is, of course a very simplified summary. The actual process and procedures will vary dependent upon how neglected your hull and keel are and if there are any blisters that need repair or any fairing that needs to be completed.

If doing the keel it's best to take it down to clean, solid, shiny metal, fill, fair, barrier coat and bottom paint.. if it looks like the OP's keel.

There are also many variations of bottom paint. http://www.pettitpaint.com/fileshare...painttypes.pdf

You might want to ask around your marina and see what others have success with.
08-17-2014 04:24 PM
Cincy020
Re: Bottom paint

I purchased a new to me boat as well and the bottom looks very similar to the OP's. Is the best way to prep for new paint to sand the bottom and then paint? Also, what is the difference between barrier coat and bottom paint? Personally, I will be in for 6 months at a time in fresh water.
08-09-2014 10:51 AM
ccriders
Re: Bottom paint

Quote:
Originally Posted by ianjoub View Post
Should I put the outdoor oil based primer and top coat on top of the barrier coat, or instead of the barrier coat?
Barrier coats are for boats that spend a lot of time in the water. If you are not going to use antifouling paint because you intend to haul the boat after every use, then I would forego the barrier coat, given that the gel coat is in decent condition. Spend that money instead on something you actually use, like a new sail.
John
08-08-2014 09:05 PM
CatMan22
Re: Bottom paint

My boat looked similar to yours a month ago, I took keel off, sand blasted, epoxied, faired and painted it, sanded and painted the bottom, did not go through gelcoat. Heres a couple before and after photos.

Attachment 34081

Attachment 34089

Attachment 34097

Attachment 34105
08-08-2014 03:59 PM
ianjoub
Re: Bottom paint

Quote:
Originally Posted by TQA View Post
Sandblasting is better just much messier. Lots of yards won't let you do it but I guess you are home.

You can skip the Ospho if you do a good job sandblasting. Just get the paint on right away.

Re the epoxy comment on UV sensitivity it will chalk in direct sunlight. No probs on the keel but maybe on the hull below the waterline.

You probably don't want to spend big bucks so a household oil based outdoor primer and maybe top coat will do.
Yes, I am not at a marina. I have the boat at my auto repair shop.

Should I put the outdoor oil based primer and top coat on top of the barrier coat, or instead of the barrier coat?
08-08-2014 02:41 PM
TQA
Re: Bottom paint

Quote:
Originally Posted by ianjoub View Post
I have a pressurized sandblast kettle. I think that may be easier...

I just researched Ospho, sounds like good advice!
Sandblasting is better just much messier. Lots of yards won't let you do it but I guess you are home.

You can skip the Ospho if you do a good job sandblasting. Just get the paint on right away.

Re the epoxy comment on UV sensitivity it will chalk in direct sunlight. No probs on the keel but maybe on the hull below the waterline.

You probably don't want to spend big bucks so a household oil based outdoor primer and maybe top coat will do.
08-08-2014 11:10 AM
ccriders
Re: Bottom paint

You need to check the UV sensitivity of barrier coatings before deciding not to paint. Epoxies normally have to be coated with a UV protecting layer or will deteriorate rather quickly.
John
08-08-2014 09:02 AM
ianjoub
Re: Bottom paint

Quote:
Originally Posted by TQA View Post
Rent a needle gun [ use eye protection. ] get rid of the rust. Paint with Ospho. Two coats of zinc rich epoxy primer. Fair then two more coats. Do it on a warm dry day and get the first coat of primer on ASAP.

But using a wire brush, Ospho followed by some Home Depot spray galvanizing fair then a coat of anything will do as well. Just keep the paint handy because you will need to keep touching it up.

Not sure what is best for the hull. Definitely rub it down smooth and definitely apply a coat of primer after that ? Not sure. When I had a trailer sailor I applyed VC 17m and it was still looking good when I sold it 2 1/2 years later. But it is not cheap.
I have a pressurized sandblast kettle. I think that may be easier...

I just researched Ospho, sounds like good advice!
08-08-2014 08:55 AM
ianjoub
Re: Bottom paint

Quote:
Originally Posted by Puddin'_Tain View Post
Sand and/or wire brush it, slap on some fairing compound, sand it some more, apply some primer, and some paint.
What is fairing compound? Are you referring to body filler?

Edit: I see there are marine specific ones...
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