Polyurethanes and lacquers are not compatible with each other. Applying one over the other may cause problems with adhesion.

Polyurethane systems either cure through the reaction between organic isocyanates and hydroxyl containing compounds or contain urethane linkages in the molecular structure and dry by one of the other mentioned mechanisms. Urethane oil and alkyds are basically similar to ordinary oils and alkyds, except that the incorporation of urethane linkages into the molecules causes much larger molecules to be prepared.

Minwax® Lacquer Sanding Sealer is formulated to work as a base coat under Minwax® Brushing Lacquer. It is easy to sand, dries quickly, and seals the wood in just one coat. Once sanded, it provides a smooth, even surface that is ready to be top coated with Minwax® Brushing Lacquer. For consumers who want an ultra-smooth finish, we recommend that they apply a coat of our Minwax® Lacquer Sanding Sealer prior to applying a coat of Minwax® Clear Brushing Lacquer.

Polyurethane is a term used to describe a wide ranging family of elastomers (any compound exhibiting the characteristics of natural rubber; stretchy and elastic.). Poly meaning "many" and "urethane" the classification of the chemical structure. Polyurethane or urethane for short, is used as a solid cast material (bushings). Polyurethane can be as soft as a rubber band or as hard as plastic.

Nitro is often called a "thin skin" as it really allows the guitar to resonate freely. It has a superior feel and a super glossy look to it. Poly is almost like a thin layer of plastic. It feels tacky and doesn't allow the guitar to resonate very well. Most companies use poly because its faster to work with.

Polyurethane foam includes two types, flexible and rigid. The flexible foams that we use are open cell foams, used for packaging and available in a wide range of densities and colors. It has the ability to absorb shock from an impact and recover it's original shape quickly. It's physical performance characteristics make it ideal for protecting fragile items.

If thinning is needed, use the thinner recommended on the label. If strong solvent is added, uneven gloss, wrinkling, and dissolving of previous coatings are only a few of many problems that can be caused. All thinner must evaporate from a coating before a film can begin to cure. Solvent is normally added to change consistency for different application methods.

Spray polyurethane foam was commercially developed in the United States in the mid-1960's. Homes have been insulated with spray foam since that time.

The best information we have acquired about this is from the people that prefer to use polyurethane. Here is a list: The key is to use a lube that will not wash out easily. A normal automotive type lube/grease will work or use a marine type lube. Check with your local marine/boat dealer for this. You can also use silicone spray lubricant (available in auto parts stores), it will provide an easy but temporary relief from squeaks.

No. Despite the similarities in their names, Shellac and lacquer are not the same, and are not related. Shellac is an insect resin secreted by the Lac bug, which lives in India and Southeast Asia. Shellac’s solvent is alcohol. Lacquer is based on cellulose nitrate (nitrocellulose) with resins added to make it less brittle, and nitrocellulose is made from wood pulp. Lacquer’s solvent is lacquer thinner.

The drying of any woodstain or clear coating will vary considerably with temperature and humidity. The colder or more humid it is, the longer the coating will take to dry. Too warm and the coating will dry before you can apply it properly. Always try to apply coatings when temperatures are between 10 and 30 degrees C and the relative humidity is around 50%. You should not apply a coating if the temperature is likely to drop below 10 degrees C within the next four hours.

Brushing lacquers are formulated for application with a brush. Spraying lacquers are formulated to be applied using specialized spray equipment. Spraying lacquers do not give satisfactory results when they are applied with a brush, as they are sticky, hard to brush out, and leave a streaky finish. They also dry very quickly. They tend to be difficult for a DIYer work with.

Polyurethane bushings are designed for a performance like ride. Polyurethane may squeak if not properly lubricated. You should use a lubricant that will not wash away. Once the lubricant is washed out or contaminated from road grime the lubricant will no longer be effective. This can cause premature wear on the bushings. You will need to re-lubricate. Rubber bushings are designed for the "street" use only vehicle. They provide a more factory like ride.

Polyurethane Foam is a two part liquid that when spray-applied, expands up to 30% to form a monolithic, seamless, lightweight roof surface normally used in low slope roofing systems.

We recommend three coats simply because it lasts longer. Three coats will leave your hardwood floors in good shape for at least 10 years barring excessive traffic and zero maintenance. Two coats will keep your floors in good shape for at least four years, maybe a couple of years more if you take real good care of them and traffic is minor.