This penetrating copolymer sealant is formulated to be so thin that by using capillary action it can find its way inside fine cracks and set to a clear, flexible seal. Use on wood, rubber, glass, metals, fiberglass, Lexan, ceramic and concrete.
I sealed shrouds, and ports with a 100 percent success. Some voids took 8 applications to build up to the surface level. It penitrates like crazy, you have to be careful not to use to much at a time or it will drip inside. I get the feeling it fills the whole void. I thought I would have to do it every few months, it's been a year now, no leaks, and the same spots won't take any more. My boat is an Irwin 10/4 that is moored in Florida year round.
I would have picked a small item like this up at the local West Marine store, but your Norfolk Store was recently moved to far away to be practical for me to drive that far. However, the on-line store works well. This item came in three days. Just used Cap't Tolleys so not sure about being durable but seems to work well and easy to use.
Used this product to seal around the cabin windows on my 1984 Newport 28 and it worked perfectly!! - After 6 months there is no hint of leaking around the windows! This product provided an easy and economical solution for a problem those of us with older sailboats are facing. Be sure to follow instructions carefully.
Despite the ridiculous name (source of some good humor at the my marina), Capt. Tolley's Creeping Crack Cure does everything it promises to do, and more. Amazing stuff, very useful product for wooden boat restoration.