We installed Spartite on our 34 in 2009 to help mitigate leaking at the mast — here are a few observations:
It initially seemed to do a good job of making the seal which looked almost perfect, visually. But after one typical severe Lake Superior winter, causing mast contraction, then expansion, the Spartite had slightly lifted away from the collar. I expect it would have fared much better in a lower latitude climate with more moderate temperature extremes.
We perhaps could have found a way to re-settle it back in place in the collar, thus continuing its use, but we discovered that our leaking was due to deteriorated bedding under the mast collar, so we had to lift the mast a bit and cut away the Spartite to facilitate lifting and rebedding the collar.
Based on our experience, Spartite appears to be a decent product (albeit expensive). It’s easy to work with, and having planned the project out carefully, it truly appeared to be doing a fine job of sealing the mast at the collar, before the winter-induced mast shifting.
I will admit, however, that we did not pull the mast and replace it with the Spartite in place, so I can’t say that it would have worked properly after mast R&R.
The Spartite fit perfectly, so after removal and cutting away, we are still using four pieces of it for centering the mast instead of wedges — that works great — still getting our money’s worth from it I suppose.
Our original 26 year-old mast boot is still siliconed properly in place and doing its job well. We’ll continue relying on that for now.
Cheers
Dave