Fairing Compound

Jaybeaux

Well-Known Member
Jan 3, 2016
2,024
Upper Potomac River
Boat Info
2006 Sea Ray 48
Naught On Call
Engines
Cummins QSC-540s with V-Drives
11 KW Onan Genset
Looking for advice, recommendation, etc for a good fairing compound for below the waterline use. I have a few gelcoat blisters that I am going to address this winter while my boat is on the hard. The blisters have been "popped" and are drying. Next step is to sand/grind the edges back in preparation for fairing.

The blisters are located near the aft transduecer location. This area is covered with bottom paint. I do NOT intend to put gelcoat over the repair. Would I need to put an epoxy barrier coat over the fairing compound? Are any primers needed before application of anti-foul paint?

The total area is going to be less the 1 square foot.....much less actually.

Any advice or guidance is appreciated.

Jaybeaux
 
We are not suppose to get blisters. Do you have a cause ?
 
For something like this, I would just mix up some thickened epoxy and be done with it. Since you're putting anti-foul back over it, you don't even have to worry about making the repair pretty - and "close" to smooth is all you need. Don't go crazy with it. No barrier coat will be needed. That said, this isn't the only way to skin the cat.
 
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Oh man... I got sucked in the video of the old guy building that skiff at the bottom of your website for Total boat... There are 37 episodes...I pasted a few...the finished boat is the last one

 
Looking for advice, recommendation, etc for a good fairing compound for below the waterline use. I have a few gelcoat blisters that I am going to address this winter while my boat is on the hard. The blisters have been "popped" and are drying. Next step is to sand/grind the edges back in preparation for fairing.

The blisters are located near the aft transduecer location. This area is covered with bottom paint. I do NOT intend to put gelcoat over the repair. Would I need to put an epoxy barrier coat over the fairing compound? Are any primers needed before application of anti-foul paint?

The total area is going to be less the 1 square foot.....much less actually.

Any advice or guidance is appreciated.

Jaybeaux
I’ve used both Interlux Watertite and Total Boat they both worked well and did the job on blisters and gouges. I think I prefer Total Boat as it seemed to mix a little easier. After sanding smooth I bottom painted right over with Pettit SR-21 and have had no problem.

Rick
 
For something like this, I would just mix up some thickened epoxy and be done with it. Since you're putting anti-foul back over it, you don't even have to worry about making the repair pretty - and "close" to smooth is all you need. Don't go crazy with it. No barrier coat will be needed. That said, this isn't the only way to skin the cat.

The only issue I see it that he said the blisters are (near) the transducer. The critical area would be in front of the transducer. If a repair in front of the transducer causes disturbances/air bubbles, that will affect the transducers performance.
 
We are not suppose to get blisters. Do you have a cause ?

I don't "have a cause". These were found on my out of water survey this past Aug/Sep. Surveyor recommended to haul out and store on the hard for the winter. I happened to see my surveyor at the marina yesterday so he took a few minutes to followup. He showed me how to "pop" the blisters and prepare the area for fairing.
 
The only issue I see it that he said the blisters are (near) the transducer. The critical area would be in front of the transducer. If a repair in front of the transducer causes disturbances/air bubbles, that will affect the transducers performance.
Agree. To clarify, though, I don't mean to be "sloppy" in the repair... just that he doesn't have to go crazy with making it super smooth. In most cases, fairing the epoxy with a putty knife is about all you'll need. Worst case, a quick little sand.
 

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