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How can I make cardboard waterproof?

To make cardboard waterproof, you can apply a waterproof sealant or coating such as polyurethane spray, acrylic spray, or waterproof paint. These products create a protective barrier that prevents water from seeping into the cardboard.


Can water-based polyurethane be applied over oil-based polyurethane?

Yes, water-based polyurethane can be applied over oil-based polyurethane after proper preparation and sanding.


Can I use polyurethane over epoxy for my project?

Yes, you can use polyurethane over epoxy for your project.


How do you preserve cardboard?

polyurethane in a spray can. semi gloss or satin finish. use a light coat. its about 7 bucks a can.


Shellac over polyurethane?

A coat of shellac can be placed over polyurethane. You should use de-waxed shellac if you plan on placing more polyurethane on in the future.


Can you apply polyurethane over epoxy?

Yes, you can apply polyurethane over epoxy as long as the epoxy has fully cured and been properly prepared for the polyurethane application.


Can you apply polyurethane over old polyurethane for refinishing furniture?

Yes, you can apply polyurethane over old polyurethane when refinishing furniture. It is important to properly prepare the surface by sanding and cleaning it before applying the new coat of polyurethane for best results.


Can you apply oil-based polyurethane over water-based polyurethane?

No, it is not recommended to apply oil-based polyurethane over water-based polyurethane as they are not compatible and may not adhere properly. It is best to stick with the same type of polyurethane for a consistent and durable finish.


Can I apply oil-based polyurethane over water-based polyurethane?

No, it is not recommended to apply oil-based polyurethane over water-based polyurethane as they are not compatible and may not adhere properly. It is best to stick with the same type of polyurethane for a consistent and durable finish.


What are the differences between applying water-based polyurethane over oil-based polyurethane?

When applying water-based polyurethane over oil-based polyurethane, the main differences lie in the drying time, odor, and color. Water-based polyurethane dries faster, has a milder odor, and may not yellow as much over time compared to oil-based polyurethane.


Is it possible to apply polyurethane over paint?

Yes, it is possible to apply polyurethane over paint as a protective coating.


Will polyurethane yellow over time?

Yes, polyurethane can yellow over time due to exposure to light and heat.