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Postby Guest » Tue Mar 27, 2001 2:33 pm

I have tried a couple different mast boot arrangements over the year and a half I have owned my 80, none of which are ideal. Most recently I have been using the Mast Boot Tape sold in major stores, which does a good job of keeping out water but tends to get severely chafed by jib sheets and needs to be replaced quite often. Before that, I had a fabric boot attached by large hose clamps which leaked a bit and the clamps are hard to tape over to prevent snagging sails, etc. Has anyone found a really good solution to this problem?

Postby Guest » Tue Mar 27, 2001 8:31 pm

I know what your talking about. The mast boots that come with the new boats are not that great (they suck). I have been using plastic and tape (lots of tape). If anybody else has found something better please share.

Postby Guest » Wed Mar 28, 2001 12:49 pm

Spar-tite, poured in around the mast. Definately the way to go (at least on a J24).

Postby Guest » Wed Mar 28, 2001 2:02 pm

I used SparTite on my J-24, but there are two problems with using it on the 80:
1. We sometimes adjust prebend by shifting mast blocks fore and aft.
2. I believe Spartite will be degraded by UV if it is not covered (though it can be painted).
Has anyone used this on an 80?

Postby Guest » Sat Mar 31, 2001 2:03 pm

I was wondering about the use of Spartite to replace the wedges and the boot. Has anyone tried it?

Postby Guest » Sun Apr 08, 2001 9:20 pm

I just got back from the J World San Diego racing school. Their boats are tuned per the North method. They use Spar Tight on all their J/80s because nothing else holds as well and, without it, the boats get out of tune faster. Wont work, however, if you are taking the spar down often.

Postby Guest » Tue Apr 17, 2001 8:16 pm

I have used Spartite on several boats (J-92, Schumacher 40) and found it to be excellent. It will not, of course seal the water that runs down the inside of your mast, but it will block most of the outside water.

If you fashion it good and thick, and apply plenty of petroleum jelly to the partners, you can take the mast in and out as often as you please. Spartite will stick to the mast, not the partners.

It is a mess to use, and you must folllow the instructions to the letter. I put boot tape over it, more to make it pretty than to protect from UV. but what did I know. The system beats having those little red blocks dropping out when you least want it (heavy air).

Postby Guest » Fri Apr 20, 2001 8:29 pm

Where do you get spar tite?

Bob von Felten

Postby Guest » Fri Apr 20, 2001 8:47 pm

West Marine if you can't find it anywhere else.

Postby Guest » Wed Nov 07, 2001 9:55 am

How important is the positioning of the mast blocks? I have ones that are solid flexible plastic and I try to mix and match them to keep the mast relatively centered between the partners. The last time I put the boat together we had to force the front ones in pretty hard.


1. Should the shrouds be tensioned correctly first and then the mast blocks installed?

2. Should the mast blocks be some type of hard plastic as opposed to rubber?

3. Should they require a hammer to install?

Postby Guest » Wed Nov 07, 2001 12:01 pm


The position of your mast in the partners is very important. The sail design you have needs to match the mast bend and headstay tension of the boat in order to get the most boatspeed in a given wind and wave condition. For our sails (North) you set the mast butt position first and with your headstay length the mast will seat itself in the partners. I have found the partner positions vary slightly from boat to boat but for most boats the mast will sit 1/4" from the aft part of the hole. The factory rubber aft block will ever so slightly push the mast forward creating a small amount of pre-bend and headstay sag. The forward mast block then fits snug (with some suntan lotion). On my new boat I even had to add another 1/8" of wedges to the forward block to insure no mast movement. Our Tuning Guide is online if interested at

PS- Your boat looks great! I saw it last weekend when I was at an Optimist regatta at AYC with my son.

Good Luck,

Jay Lutz

Postby Guest » Wed Nov 07, 2001 6:10 pm


I am not sure Jay answered your direct questions:
1. Install blocks before tensioning shrouds.
2. Any material that keeps the mast in place should work, though a softer material might be easier to insert.
3. See 2 above.

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