Sanding and the sealer coat
February 28, 2011 § Leave a comment
Sanding is one of those things where it’s difficult to know when to stop. After all, how smooth is smooth enough?
Usually I get to the point of diminishing returns. In other words, continued sanding serves only to reveal gaps between strips and doesn’t add much in the way of smoothness. When I get to this point and the canoe is as smooth as it’s likely to get, I put the sander away for a while.
I should have mentioned something about the crack-filling process. There will be gaps between strips, either because of imperfections in the wood or a bad mating of strips. These gaps are easily filled with wood filler or a mixture of epoxy and sanding dust, mixed to the consistency of peanut butter. Wood filler (or plastic wood) tends to appear lighter than the surrounding wood when epoxied, while the epoxy/wood flour mixture tends to appear darker. While I’m glad that I didn’t use wood filler between strips, I should have used it to fill screw holes on the ash stems. Ash doesn’t darken as much as cedar under epoxy, and as a result, the epoxy mixture gave me dark dots on the stem. Live and learn.
When the sanding was done (or rather, when I was done sanding), I put a sealer coat on the canoe. The sealer coat is optional, but I like doing it. For one, it allows the wood to absorb epoxy so that it doesn’t absorb as much when the fiberglass is applied. The sealer coat also gives you a great idea of what the canoe will look like when it is glassed.
And here is a pic of the completed hull.
Next step: fiberglassing.