How To Sand Polyurethane Between Coats

You dont need the lower coat to be super smooth because the upper coat will cover the roughness from sanding anyway. The purpose of this instruction is to create scratches in the surface so the next coat of finish can establish a mechanical bond. Let dry 4 6 hours.
how to sand polyurethane between coats

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Its best to apply polyurethane to flat as in level surfaces so the finish can self level and is less likely to drip.

How to sand polyurethane between coats. Referencing steps from the directions on the can and the minwax website. Allow each coat to dry fully. First it will smooth out any roughness and debris that may have gotten into the finish. Second polyurethane doesnt have real good intercoat adhesion.

Coat the entirety of your workpiece but dont brush excessively or youll create areas with too little polyurethane. I did not sand between coats. Apply two to three additional coats of full strength polyurethane sanding between each coat. You sand polyurethane to a remove any dust bumps in the lower coat and b cut the surface of the lower coat so that the upper coat has more surface area to bond to.

Between each coat the polyurethane must be sanded with a light grit sandpaper. You must sand between coats for good intercoat adhesion. To create a good resistant finish multiple coats of the polyurethane may be required on the wood surface. Polyurethane is a type of varnish with a resin that adds heat scratch water and solvent resistance to the wood on which its applied.

Scuff sand between coats to get a good bond. When applying polyurethane brush along the grain stretching the polyurethane into as thin a coat as. So thats pretty much all i have to say on sanding between coats of polyurethane. To give the subsequent poly layers something to bond to sand lightly between coats with 320 grit sandpaper wrapped around a hard block.

Dont sand after you apply wood stain. You dont have to do it if you buy this poly from minwax and get a second coat on within 12 hours. Apply a thin coat of minwax fast drying polyurethane using a high quality natural or foam brush. You do have to sand between coats of polyurethane on floors usually with 220 grit sandpaper with most other polyurethanes.

Minimize this problem by applying thinner coats or by switching from standard brush on poly to a wipe on or spray finish both of which can be applied in very thin coats. Again because it is not required between coats again based on other answers required. The finish keys or locks into the sanding scratches. When applying polyurethane on vertical surfaces you may experience drips or runs.

Polyurethane requires sanding between coats for two reasons.