New thru hulls .. is this ok? - SailNet Community

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Old 04-08-2012
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New thru hulls .. is this ok?

Hi all. My C&C 32 has (had) flush thru hulls. The flange on them was very wide (over 2.5 inches for .75" thru hulls), the flange was about 3/16" thick and hull was recessed to accommodate them. I have had no luck sourcing replacements. The fibreglass did not have any gelcoat over it or anything in the recess so I went ahead and put a layer of epoxy down as a kind of barrier coat.

Now, I could fill and fair the recesses but I'm concerned that I won't do a good job of it having never done any fibreglass or epoxy work before this. Is there anything wrong with leaving them as is? See pics below, that's the new thru hull sitting in the recessed cavity. I would of course be using some sealant when installing this for real, that's just a dry fit.

What do you folks think?





The white area of course is the recessed section. Again, it's about 3/16" deep. The hull is solid and pretty thick in this area.
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Old 04-09-2012
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Re: New thru hulls .. is this ok?

PERKO Thruhull at West Marine

Here is flush mounted thru-hull. Don't know if it is the right size, but there are many.

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Old 04-09-2012
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Re: New thru hulls .. is this ok?

I wouldn't like the exposed side of gel/fiberglass coat. I also assume that this would slow the boat down with the eddies these "imperfections" create. Find out what the original ones were and replace equal. DrB gave you a link. Bottom line I would not keep it as in the pictures.
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Old 04-09-2012
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Re: New thru hulls .. is this ok?

Check the C&C site on the net - they have links to the old suppliers as well as an outfit that carries proprietary C&C stuff.

C&C Yachts - C&C Photo Album & Resource Center

If you can't find equal replacements, you MUST glass over the conical depressions.
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Re: New thru hulls .. is this ok?

Those perko ones aren't the right size. I have looked, and I have checked with the C&C mailing list and the site. The closest I got were ones from buck algonquin but they were no good either.

I guess I'll just glass over it, fair and redrill. Either that or mix up some thickened eqoxy, stick the thru-hull in until flush with the hull, scrape away any excess and tape some clear plastic sheet over to keep it flush. I hear about "mold release wax", is there a special type or any wax product will work?
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Last edited by smp; 04-09-2012 at 07:12 PM.
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Old 04-09-2012
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Re: New thru hulls .. is this ok?

Those look like Forespar Marelon thru hulls. I just replaced mine and they look identical to yours. The 3/4" flush thru hulls have an outside dia. of 2.43". Check out Forespar's website, has all the dimensions.
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Old 04-09-2012
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Re: New thru hulls .. is this ok?

If your into racing then I would fair it out, if not seal it , use it, and call it done. PHRF matters if you race and that would matter
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Re: New thru hulls .. is this ok?

Quote:
Originally Posted by wm1999 View Post
Those look like Forespar Marelon thru hulls. I just replaced mine and they look identical to yours. The 3/4" flush thru hulls have an outside dia. of 2.43". Check out Forespar's website, has all the dimensions.
Not sure where you saw marelon in those pictures .. maybe the white area? That's just exposed hull, raw fibreglass layup. Recesses were cut into hull when boat was made. I should post a picture of the thru-hulls I removed to give people an idea, they have a very wide flange and believe me, I've looked high and low for replacements and they don't exist. Someone at a local chandlery suggested that they were probably machined. I've considered marelon but I've decided to stick with bronze. If there is a marelon thru-hull that will fit flush I haven't found it.
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Re: New thru hulls .. is this ok?

Quote:
Originally Posted by CorvetteGuy View Post
If your into racing then I would fair it out, if not seal it , use it, and call it done. PHRF matters if you race and that would matter
I believe leaving it as is would be sound. But yeah, I'm not racing now but I believe I would like to down the road so this is good input. I may try my hand at fairing the recessed flush with the rest of the hull.

Mold release wax? Any wax or special product?

Thanks
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Old 04-10-2012
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Close Enough for the Government?

Quote:
Originally Posted by smp View Post
If there is a marelon thru-hull that will fit flush I haven't found it.
Boat Marine Plumbing Flush Head Threaded Thru Hull

Look at the dimensions of the Marelon Thru-Hull for the flush mounted 3/4" thru-hull. Flange is 2.43, which is pretty close to 2.5 inches that came out of the boat. If you are set on using bronze, then this is a moot point.

DrB
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