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Friday, January 25, 2008

More about this Coosa Stuff

If you have been following this blog, you know I rave about this Coosa board. A glass reinforced polyurethane replacement for plywood.

  • cuts easily
  • light
  • resin really sticks to it
  • does not absorb water
  • will not rot
  • strength comparable to plywood (actually, a little less in some characteristics).

Well. there are a few other things I have come to like about it. Shaping with a grinder

Coosa can easily be shaped with a grinder. For example, when cutting bulkheads, if you cant get that nice fit from your tick-stick and/or door skin template. Spot sculpting the edges here and there with a 36 grit grinding disc gets it shaped nice and quickly. Faster and easier than taking a jigsaw to it.

Routing is a snap You can really get some really clean smooth cuts with a router, almost like it were solid wood. Routing plywood tends to produce more messy and rougher cuts. Of course router bits dull much more quickly due to the glass, so, having spare sharpened bits is a must. Of course there are some things to watch out for. Glass Particles When you take a router or grinder to Coosa, it really vaporises the stuff into small particles. That means there are tiny glass particles in the air that are probably too small for a simple dust mask. If you really want to save your lungs, a respirator should be worn. Painting The surface of this stuff is more pourous than plywood. Painting it requires twice as much paint. Where possible it is worth painting a light coat of resin first to seal the surface, then applying color paint. That is assuming the paint you are using is more expensive than the resin.

Oh, and one more nice thing about Coosa: a wood chisel works really nice on it too.

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