The water based poly will remain clear. Applying polyurethane over a painted surface will give it an impeccably smooth finish.
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I dont have any experience with it but a clear latex paint is another.
Can i use polyurethane over latex paint. Polyurethane can be oil or water based and you can use either kind over latex paint. For best results enamel paint should be allowed to dry for three to seven days before applying the finish. You can apply polyurethane over any type of paint as long as its clean and has been properly prepared.
Although latex paint dries to the touch in a few hours it can take up to 30 days to cure depending on the color and thickness of the coating and the ambient temperature and humidity. Unfortunately when many do it yourselfers apply polyurethane over a water based latex or acrylic paint they end up with rampant flaking. Polyurethane can be used over enamel paint which often provides a harder finish than latex based paints.
Ideally paint over polyurethane when the temperatures are above 70 degrees. I would not put an oil based polyurethane over latex paint or oil based paint for that matter. You would be better off using a water based polyurethane.
A polyurethane finish can prolong the life of paint and prevent ultra violet rays from causing it to fade. Assuming you want the paint color under the finish to remain visible and unaltered choose a water based polyurethane for your project. Coats and dry times to get a solid finish apply three coats of paint over the oil based primer.
Preparation and application procedure if youre coating fresh paint allow the paint to cure first. However oil based polyurethane tends to yellow as it ages whereas water based varieties stay transparent. Its important to wait for the latex paint to fully cure before you coat it with polyurethane or the latex undercoat may not harden fully.
Painting over any solvent based paint or finish with a water based paint latex or acrylic can be problematic. Failure to allow proper drying time can lead to the paint chipping or peeling and may reduce the effectiveness of the topcoat. An oil based poly will yellow over time and make the white paint yellow.
Polyurethane coatings are made with mineral oil solvents or may be a water based polyurethane so the answer depends on what you are repainting with and which polyurethane you are painting over. The poly gives the paint treatment more depth especially on a piece ive distressed. As a rule of thumb its best to wait at least 14 days before coating fresh latex with polyurethane.
Furthermore polyurethane application is a very simple procedure that virtually any household handyman is capable of tacklingprovided of course that theyre armed with the proper set of tools and a helpful set of instructions. Ive never had a problem with this process. For the paint treatment i normally use rustoleums american accents acrylic latex then rub on several coats of oil based wiping polyurethane.
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