Innertube size for mast boot


Member II
While the mast is down I'd like to put on an innertube mast boot. I tried a leaky tractor tube that I had on hand. It seemed a likely candidate when I draped it deflated over the mast, but it ended up being too big. I'm wondering if anyone knows what size tube has worked well for them? The mast circumference on my 38 is listed as 21 and 7/8 inches. I can't find anywhere that lists girth of a deflated tube. I'd like to avoid buying and cutting up a bunch of tubes to find the right fit.


Sustaining Member
Blogs Author

Loren Beach

O34 - Portland, OR
Senior Moderator
Blogs Author
I have read some where to use a toilet bowl WAX RING push down around it (mast & deck) then tape.
Any reviews on that method?
No in-use review :) , but that wax will compress and ooze out over time. It has no structural integrity.

I would go with Tom's solution.