Re: Water abssorbtion


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Posted by B.B. on February 14, 2005 at 08:14:33:

In Reply to: Water abssorbtion posted by Nicklas on February 14, 2005 at 08:12:56:

Hello Nicklas!
: : : It is not the gelcoat only that absorbs moisture. The laminate in such an old hull absorbes substantially more and you will have added about 50 kg within a few weeks. Coating with any kind of material that cures at normal temperatures only slows down the absorbation with a few weeks and is a bit dangerous as most IF:s are apt to hydrolyse. Antifouling only is the best option.
: : : However all IF:s have become a bit soft in the laminate and allows the hull to twist a little which decreases the sailing properties.
: : : If you want to be in top, I recommend to drill 10mm holes through 4/5 of the laminate 20 cm spaced all over the bottom on the aft 3/4 of the hull and then fill them with Plastic Padding Marine Epoxy Filler. That stiffens the hull and gives an incrdible difference in winds over 4 m/s
: : : Regards Bengt

: : : Hello Bengt, tank you for a very informative forum. My question is about how much in words of maybe kg/m^2 gelcoat can absorbat water? I have an IF-boat and i have sanded of all of the old (30-years)antifouling layers + the original primer so i have more or less only gelcoat visible. Before i put her down in to the water im just going to roll on some antifouling is my plan.
: : : : : The background for the question is that im thinking of doing some racing this summer and are a bit concerned about if the boat is going up in weight during the summer.
: : : : : Tank you / Nicklas




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