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The Grudgeon Brothers Method
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fastjeff
#1 Posted : Tuesday, September 23, 2008 8:34:16 AM(UTC)
fastjeff

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Thanks to whom ever suggested this. To wit:

On SMALL areas, if you don't want to go through the etching ritual, use the Grudgeon Brothers (West Systems) method: On a freshly sanded aluminum surface, mix up a batch of 5 minute CLEAR epoxy and sand it into the surface. It's just like wet sanding only you're using epoxy instead of water. Use 40 grit paper and scratch away.

A few good strokes and the clear epoxy will turn grey--that's the aluminum oxide being removed from the "freshly sanded surface" (which tells you how fast that stuff corrodes!) Soon as the epoxy is hard enough you can slap the barrier coat right on. Nothing to it!

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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marinettejoe
#2 Posted : Tuesday, September 23, 2008 12:40:08 PM(UTC)
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Holy cow.... That's the best tip ever.....
Unzinced ships sink at slips. yep
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fastjeff
#3 Posted : Tuesday, September 23, 2008 10:52:27 PM(UTC)
fastjeff

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Agreed, Joe, but only for small areas.

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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ComputerJoe
#4 Posted : Tuesday, September 30, 2008 6:08:06 AM(UTC)
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It is Gougeon Brothers www.gougeon.com I bought their book on laminated boat construction using their West System epoxy.

They are the last remaing remanents of a long history of boat\ship building in Bay City Michigan.
I think the last drydocks and ship builder (DeFoe Shipyards) shut down about 1960. DeFoe poineered buildiing ships hulls upside down. I think the last ship built there ( a Coast Guard vessel) was sunk as a dive site off of Boyton Beach Fl. not very long ago.

Some of the builders from Bay City include the Davidson Shipyards, American Shipbuilding Company, and Wheeler & Company. There are very many "Davidson" shipwrecks from the 1800's scattered all over the Great Lakes.
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dougrose
#5 Posted : Tuesday, September 30, 2008 11:58:57 PM(UTC)
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I had an old pickup with 3-speed. One day it got noisy and I looked under to find that the bottom had been knocked off the case, and you could just look up and see the countershaft and gears.

My roommate Jim was building a trimaran in the back yard using WEST epoxy, the Gougeon system. For a temporary repair, I wet out some of his glass on a piece of wax paper, wet-sanded with epoxy around the big hole in the tranny, and lifted the glass up to cover the hole and taped it all up with duct tape.

Next morning I put in some oil and it didn't leak. It was still fine when I sold the truck a dozen years later.


1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
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