Yes, you can put polyurethane paint over eggshell in latex or eggshell in oil.
Can you put stain in polyurethane to darken the color?
More important is, that both paints are of the same kind (like: oil-based paint, acrylic paint, latex paint). Semi-gloss is more easily painted over then high gloss, but first better find out what the old paint layer is made of. Check with the help of alcohol - if paint comes off in any way when you rub it with a cloth of alcohol, it's latex or acrylic paint (and can be painted over with acrylics).
Latex paint is an indoor paint, which will not work very well on siding; you can paint it on, but it is going to peel off pretty quickly. Use an enamel paint.
You should never paint a deck, the paint will peel (unless you live in a very arid climate I guess. The deck may be stained, you can put either oil or latex stain over old oil stain.
Yes
Yes, you can apply polyurethane over paint to create a durable finish.
Yes, you can apply polyurethane over paint to create a durable finish.
Yes, you can apply polyurethane over paint to provide additional protection and durability.
Yes, you can apply clear polyurethane over paint to provide additional protection and durability.
Yes, applying polyurethane over paint can provide added protection and durability to the painted surface.
Yes, you can apply polyurethane over chalk paint to create a durable finish. Make sure the chalk paint is fully dry before applying the polyurethane for best results.
Yes, you can apply polyurethane over paint to create a durable finish. Make sure the paint is fully dry before applying the polyurethane, and follow the manufacturer's instructions for best results.
Yes, applying polyurethane over paint can provide a more durable finish by adding an extra layer of protection against wear and tear.
Yes, applying polyurethane over paint can provide added protection and durability by creating a tough, clear topcoat that helps to resist scratches, stains, and moisture.
Yes, you can put polyurethane over epoxy for a durable finish.
Can you put stain in polyurethane to darken the color?
More important is, that both paints are of the same kind (like: oil-based paint, acrylic paint, latex paint). Semi-gloss is more easily painted over then high gloss, but first better find out what the old paint layer is made of. Check with the help of alcohol - if paint comes off in any way when you rub it with a cloth of alcohol, it's latex or acrylic paint (and can be painted over with acrylics).