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Ordering "git rot" for hull delamination, math problem
http://www.hobie.com/au/en/forums/viewtopic.php?f=14&t=28216		 Page 1 of 1
Author:  branson [ Thu Jul 22, 2010 10:30 am ]
Post subject:  Ordering "git rot" for hull delamination, math problem
I have a '76 H16 and noticed the last time I went out that on each hull about 6-8 inches in front of the pylons were two soft spots. I have measured the total area of the combined soft spots to be roughly 88 inches ^2. My first assumption is that the thickness of the deck is about 1/2 inch. This would bring the total volume of the soft spots to around 88 in^3. I have searched this forum and it seems that git rot is the preferred epoxy for such repairs. The largest bottle from west marine is 34 oz and costs around $80. This 34 ounces should equal about 1,005.38 cm^3 if you assume 1 ml = 1 cc. I converted the total volume of the soft spot to be about 1,442 cm^3. So I would have to buy 2, 34 ounce cans but obviously the soft spots are not all void space that has to be filled in with epoxy. Can anyone guide me along with how much epoxy they used with a similar repair.

Best
Branson
Author:  MBounds [ Thu Jul 22, 2010 1:29 pm ]
Post subject:  Re: Ordering "git rot" for hull delamination, math problem
You're way overestimating the volume required.

Firstly, the laminate sandwich is only about 3/8" thick - and most of that is the foam core, which is mostly intact. The Git Rot only fills the void between the foam and the fiberglass laminate - which can vary from almost nothing to ~ 1/8". A more conservative estimate of the volume needed would be 88 in^2 x .0875" = 7.7 in^3 = 126 mL = 4.25 fluid ounces.

Buy two 4 oz bottles of Git Rot and you should be covered.

BTW, Jamestown Distributors has the 34 oz Git Rot kit for only $58.
Author:  branson [ Thu Jul 22, 2010 1:50 pm ]
Post subject:  Re: Ordering "git rot" for hull delamination, math problem
MBounds,

Thanks, I figured I was overestimating the actual volume the epoxy will eventually occupy, but I did not know by how much. Thanks for the quick reply, combined with the smaller volume and Jamestown Distributors this will cost me a lot less than I originally thought. One last question, if I am correct in my research this stuff takes about 24 hrs to set up, how long till the repair is ready for moderate sailing conditions, say 10-15 kts?

Best
Branson
Author:  MBounds [ Thu Jul 22, 2010 2:12 pm ]
Post subject:  Re: Ordering "git rot" for hull delamination, math problem
According to the BoatLife (makers of Git Rot) website:
Quote:
The optimum temperature for applying "GIT"-ROT is between 50° and 70°F (10° and 21°C). Only mix small batches (no more than 4 oz.) since the larger the quantity the greater the reaction and the faster the cure. After adding 1 part "B" to 3 parts of "A", shake vigorously for at least one (1) full minute (TIP: use a watch while shaking the bottle.) Once the two parts have been thoroughly mixed, a thermal reaction will begin to occur. Penetration is best immediately after mixing. When working in temperatures over 70°F (21°C), chill "GIT"-ROT overnight. At 70°F, properly applied "GIT"-ROT solidifies into a tough resilient mass overnight. Allow one week for ultimate strength. Cold temperatures will slow the cure. When painting, check compatibility with paints.

I think that answers your question.
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