Marinetex is not ideal for fairing a keel... - SailNet Community

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Old 04-25-2007
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Marinetex is not ideal for fairing a keel...

Just wanted to let you know that if, like me, you used a colloidal silica/epoxy mix the last time you faired your keel only to spend 6 gazillion hours sanding it down - and if, like me, you were thinking that this time you might want to try fairing your keel with something that doesn't take the entire sailing season to smooth out... Don't choose Marinetex !

It's great stuff - hard as a rock - bonds wonderfully to lead (and cradles). If the engine block for my diesel somehow fell out of the boat I am sure I could fashion a new, perfectly serviceable one out of Marinetex. But gosh, golly, gee whiz, darn it all - it sure takes a long time to sand this stuff away !
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Old 04-25-2007
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LOL, yes, sanding collodial silica thickened epoxy is about as fast as sanding rock. That's why West Systems doesn't recommend collodial silica for fairing situations.
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Old 04-25-2007
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I like marinetex for drill and fill aplications such as stanchion bolt holes and such as the compressive strength is quite high.
pigslo
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Almost done now - 9 hours - figure another 2 to finish. No good reason to do it to this degree as we're not racing, but if I don't I'll just sit and stew about it every time someone sails past us ( not that we expect that to happen often of course ).
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Old 04-26-2007
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Microballoon Mix

For fairing use the West epoxy and 410 Microlight filler. Mix a paste to desired thickness and spread - very easy to sand. The collodial silica mix hardens like rock...
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Old 04-26-2007
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Well, if you consider that collodial silica is basically very fine sand... you can understand why sanding it is so difficult.
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her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

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Old 04-26-2007
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Got the Microlight today - will use it for the second go around once the Marinetex is done...
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Old 04-26-2007
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Marinetek is wonderful stuff. You just want to spread it very smooth, very very close to the final shape.

And it comes in two colours.

Gary
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And it comes in two colours.
Yes it does "Hard to Sand" and "Completely Impervious"
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Old 04-28-2007
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White is better for fiberglass, etc. The grey is better for industrial (metal) machinery-related uses.
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