clear coat over latex paint forout door use | The Home Depot Community
Polyurethane is a clear varnish that dries to a hard, solid finish. It protects your wooden surfaces from scratches and prevents paint from peeling, and it's easy to clean. These qualities make it ideal for finishing tabletops, bartops, cabinets and other indoor surfaces. Polyurethane can crack and bubble if it is exposed to too much sunlight, so it isn't suitable for outdoor surfaces. Polyurethane can be oil- or water-based, and you can use either kind over latex paint; however, oil-based polyurethane tends to yellow as it ages, whereas water-based varieties stay transparent. Assuming you want the paint color under the finish to remain visible and unaltered, choose a water-based polyurethane for your project.
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I am repainting my kitchen cabinets with enamel latex paint and going to wet sand the final coat. This will create a very dull surface so I wonder if I can use spray laquer in an aerosal can as a final protective finish rather than water based polyurethane. I would say no. Latex remains soft and lacquer is a hard finish.