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  #1  
Old 09-22-2012
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Mounting Eybrows?

The mahogany half round I ordered for my new eyebrows has arrived. I'll soon need to remove the old and mount the new. What should I use stick it to the cabin house and seal the screw holes to keep water from intruding?

I'm really hoping I can use butyl tape, even though the stuff isn't very sticky by comparison to polyurathanes and polysulfides. I just got 2 rolls from Mainesail for bedding deck fittings and it works head and shoulders better than the butyl tape I got from the marina!

I'm really hoping the best stuff to use is not a polysulfide. The last time I tried that stuff I ended up being ultimately successful but I made a real mess in the process. It was a pain to clean up.

So how about it maintenance gurus? What say you?

Tom
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Last edited by dacap06; 09-22-2012 at 08:50 PM.
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Old 09-22-2012
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Re: Mounting Eybrows?

The eyebrows on my Tartan 27 screw through to the grab rails on the inside. I can't imagine just glueing hem on. Butyl will not hold without mechanical support. What's on the inside?
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Old 09-22-2012
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Re: Mounting Eybrows?

Butyl is too dense. I used some Sikaflex for mine. Wood screws to attach. Countersink and finish with bungs.
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Old 09-23-2012
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Re: Mounting Eybrows?

Quote:
Originally Posted by treilley View Post
Butyl is too dense. I used some Sikaflex for mine. Wood screws to attach. Countersink and finish with bungs.
Unless you're screwing INTO wood, don't use wood screws - use pan head sheet metal screws instead, they do a much better job of holding in fiberglass as their threads are designed to cut and they have a lot less taper than wood screws. They are also threaded full length. Their heads don't have the V shape of flathead wood screw which tend to split wood.
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Old 09-23-2012
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Re: Mounting Eybrows?

Quote:
Originally Posted by SloopJonB View Post
Unless you're screwing INTO wood, don't use wood screws - use pan head sheet metal screws instead, they do a much better job of holding in fiberglass as their threads are designed to cut and they have a lot less taper than wood screws. They are also threaded full length. Their heads don't have the V shape of flathead wood screw which tend to split wood.
Sorry, I thought it would be obvious to use wood screws in wood and also use a proper wood screw countersink.
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Old 09-23-2012
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Re: Mounting Eybrows?

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Originally Posted by treilley View Post
Sorry, I thought it would be obvious to use wood screws in wood and also use a proper wood screw countersink.
If you had spent as much time as I have on my boat, replacing and/or drilling out inappropriately used fasteners, you'd NEVER make that particular assumption.

I hardly ever use wood screws any more. even in wood to wood joints. SMS work better in most cases.
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Old 09-23-2012
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Re: Mounting Eybrows?

Seems it would be easiest to glue them on if it's truly 'just' the eyebrow trim. No holes, no bungs, no leaks later....

Carefully masking the edges with good tape prior to gluing down simplifies cleanup tremendously.

As an aside, though... how would it look to remove them altogether and avoid the future maintenance?
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Old 09-23-2012
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Quote:
Originally Posted by SloopJonB View Post
If you had spent as much time as I have on my boat, replacing and/or drilling out inappropriately used fasteners, you'd NEVER make that particular assumption.

I hardly ever use wood screws any more. even in wood to wood joints. SMS work better in most cases.
If I could like this post a dozen times. I replaced my aft trim, left the front alone because one side was recoverable. Turned out the idiots used sillycone and plated wood screws. As they rusted they cracked the fiberglass they were in and all required drilling out.
Same in the interior, brass and steel wood screws everywhere. See it on customer's boats all the time too.

I have wondered about using wodscrews with thinner material sometimes, the shoulder would help prevent pulling up and damage as the screw bites, but haven't found stainless ones yet to try.

I think you are in the right track, if it were my boat I would use one of the uv resistant 3m products instead of burly.(4000 is pretty good, but you'd want a slower cure for this). I would space my screws farther apart, dry fit with a screw on each end, tape both the hull and the trim with masking tape with a even, small space in between for a nice effect. Then remove the trim, lay a big fat bead of the 3m goop, even it out with a putty knife, bed the trim and screw in place. Tear up some paper towels and have a garbage bag ready. Use you finger to smooth the caulk, wiping excess on a scrap of paper towel every few inches. Push down fairly strongly, the goal is to cause the product to taper thinner at the edges than even the tape.

I can do this without tape, it was how I was taught to do it with granite countertops years ago, but the masking tape takes all the headache out of it, albeit with a bit more waste.
Well worth it imo.



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Old 09-24-2012
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Re: Mounting Eybrows?

Thanks for the replies, folks. I neglected to say that the current eyebrows are glued and screwed. I'm replacing them because even when I bought the boat two places had already been sanded down to the screws. I intend to fill the current holes with Marine-Tex.

I think I'm with Faster on this one -- I'll just glue them on. Taping around the site first for easy cleanup is a great idea! I'll do that.

The eyebrows are so light I'm sure I can hold them in place with tape to keep them from drifting down as the goop sets. The tape won't cause permanent damage. Some time ago, I learned that applying a little elbow grease judiciously with WD-40 on a rag removes glue residue. I've used it to remove a lot of gluey substances, including residue from duct tape that had been left on the boat long term.

Tom
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