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Uncle Ron
06-30-2002, 11:24 AM
The materials list I recieved for the Acorn 12
suggested microfibers and colodial silica. I assume the microfibers are for gap filling when
I botch the planking bevels but I'm not sure what
the colodial silica is used for.
Also, I would like to coat with thinned epoxy prior to varnish/paint. There are some pieces I would like to stain. Can I stain and still get good absorption/adhesion of the epoxy.
Thanks,any help will be appreciated.

Don Maurer
06-30-2002, 10:45 PM
I'm not sure what the micro fibers are. I use about a 50-50 mixture of wood flour (very fine sawdust) and cab-o-sil (colloidial silica) to make epoxy glue. You can certainly coat the boat with epoxy after it's assembled prior to painting. I have never tried staining, but from what I have read, as long as it is a water based stain, it should be OK under the epoxy.

wolfietuk
07-01-2002, 04:58 AM
Check the archives under CPES.

Rick

Uncle Ron
07-01-2002, 09:50 PM
Thank you very much for the help. As you may
have guessed, I'm new to this and appreciate
the support.
Thanks again.
Ron

Nicholas Carey
07-03-2002, 02:19 PM
Originally posted by Uncle Ron:
The materials list I recieved for the Acorn 12
suggested microfibers and colodial silica. I assume the microfibers are for gap filling when
I botch the planking bevels but I'm not sure what
the colodial silica is used for.If you're not experienced, you might wish to go with the designers specs for epoxy fillers. In any event, you should get and read System III's Epoxy Book, available from System III at http://www.systemthree.com/ and possible one or more of the multitudinous Gougeon Brothers' tomes, available at http://www.westsystem.com/ -- the Gougeon Brothers web site also has a ton of information online.

Microfibers and colloidial silica are both fillers used for making structural, gap-filling bonds with epoxy.

Microfibers are essentially, very finely milled fibers -- usually cotton, but sometimes kevlar or aramid. Gougeon Brothers WEST 403 Microfibers is probably the "standard" microfiber. According to the Gougeon Bros., 403 provides "good gap-filling qualities while retaining excellent wetting/penetrating capabilities". For structural use, microfibers should be used in conjuction with other fillers (such as colloidial silica -- see below.) One uses a mixture of fillers in order to construct a putty with the desired working/structural properties.

Colloidial Silica aka Fumed Silica is basically very fine silica powder. It makes a very strong epoxy putty, with very high abrasion resistance. It's not without its drawbacks as sanding it is difficult (every try to sand quartz?).

These and other fillers are readily available. Here is a list, by no means complete, of places to order these materials from:

Gougeon Brothers. http://www.westsystem.com/

Fiber-Lay http://www.fiberlay.com/. Highly recommended. Larg line of fillers and pigments. Microfibers in different lengths (1/32, 1/16, 1/8 inche). Buy in bulk if you need it.

Hope this helps.