Join Date: Jan 2003
Location: Maine Coast
Thanked 213 Times in 162 Posts
Rep Power: 16
as long as we're into it...where does 4000 fit in to the product line?
It's neither a polyurethane nor a polysulfide but rather a polyether. It's supposedly more UV resistant but in my own experience it does yellow.
It has a similar general rated bond strength to 4200 at 300 PSI.. However it bonds to gelcoat at about 424 PSI. At 500 hours it has an elongation before break of 804% but at 1000 hours it drops back to 723 which tends to mirror polyurethane products losing flexibility over time..
It would not be my first choice for below water use..
-Maine Sail / CS-36T
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Last edited by Maine Sail; 05-10-2009 at 07:33 AM.