Polyurethane Over Catalyzed Lacquer
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Polyurethane over catalyzed lacquer. Comment by greg. Two component catalyzed polyurethanes have several acronyms including 2 part 2 component 2 pack 2 package 2k urethane and 2k pu. This exclusivity has occasionally prompted a condescending snicker or two in professional circles when discussing the merits of lacquer over polyurethane.
They are used on everything from wood cabinetry mill work and furniture to planes trains and automobiles. Lacquer varnish shellac conversion varnish and polyurethane all serve to protect a wood product from water heat and other spills. For preservation i would suggest a polyurethane over a lacquer or pre catalyzed lacquer that would be the harder tougher product that would seal it the best form moisture penetration and uv light rays which are the cause of aging the variation in the relative humidity making the wood expand and contract on top of the bombardment of uv to one degree or another.
Cv will often have a slightly higher percentage of solids by volume than the lacquers and may take a little longer to dry. Catalyzed lacquer with only a few exceptions. It also provides some additional wear and chemical resistance over the lacquer products.
A catalyzed lacquer is a coating that dries by evaporation acting very much like a straight lacquer defined above with no chemical curing or crosslinking and then cures by the reaction initiated by the catalyst. Conversion varnish is a post catalyzed coating with good spraying properties excellent durability and resistance to. Second polyurethane is not the best choice for painting over lacquer finishes.
The pot life is. By applying a topcoat you can have a finished wood project that lasts for a long time to come. Polyurethane will not bond.
Catalyzed polyurethane clear coats and paints are prized for their durability and versatility around the world. However each type of finish has a variety of pros and cons that you should consider to better determine which may be right for your application. Catalyzed lacquer finishes will not respond to the thinner and it really is not necessary to protect them.
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