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Expert's Corner — fish eye

TIP: Polyurethane and Sealers

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Oil-based polyurethane is a very durable and hard-curing finish. It bonds well to itself, especially if each coat is sanded a little after it has dried well enough so it powders. This creates fine scratches, which improve the bonding of the next coat. It’s a good idea to do this fine sanding between coats anyway to remove dust nibs. But polyurethane doesn’t bond so well over finishes marketed as sealers, especially over sanding sealer. This sealer is good for use under non-polyurethane varnishes because regular alkyd varnishes gum up sandpaper. So to speed production, a sanding sealer can be used...

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Wax for Table-Saw Tops

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If you want to make the tabletops on your stationary machinery (table saw, band saw, jointer, etc.) slicker so boards slide easier, use paste wax, not furniture polish. And choose a paste wax sold for furniture or floors rather than for cars. The reasons for both instructions are the same. Many furniture polishes and paste waxes for cars contain silicone, which could transfer to the wood and cause finishing problems—specifically fish eye (cratering). Furniture or floor paste waxes shouldn’t cause any finishing problems as long as you buff them out well on the tabletops.

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