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Refinishing interior teak
Haven''t read the article in Sail Mag so don''t know what was covered. But can offer my 2 cents worth.
Old varnish can always be sanded down to a smooth surface regardless of how poorly it may have been applied. Use a sanding block for all the sanding you can, as it is the only way you will be able to level out all the valleys and peaks to a nice level surface. 150 or 180 grit is good for the rough stuff. When it starts to look pretty good go to 220 to sand out any scratches from the coarser grits.
As for the fiberglass, I''ve found a razor blade carefully used will lift most of the varnish from a fiberglass surface. The residue can usually be cleaned up with a rag dipped in acetone. If the residue is not coming off, use a little varnish remover to loosen it and it should wipe it off in a few minutes.
Before you repeat what the previous owner did, learn all you can about varnishing.
Casey''s book, Sailboat Refinishing is very good, Brightwork by Rebecca Wittman will make you want to turn your boat into a violin! It is not easy to do a good job without some experience. Try a small area and see how it turns out. When you feel confident, go for it!
Spar varnish is the only thing to use on the exterior, but I''ve learned that polyurethane varnish on the interior is easier to apply, and provides a harder surface. It should last for years.
A nicely varnished interior is the often the difference between a sailboat and a yacht!