Polyurethane Over Shellac Problems. Even the back of the shellac can itself says not to use polyurethane. I will try anything before i strip it all off and start over. Can a urethane finish be used over shellac?

128 Shellac Under Polyurethane The Wood Whisperer Pecky Cypress Polyurethane Shellac from i.pinimg.com

I run into that problem all the time at home depot. Misterp | posted in finishing on october 30, 2005 02:11am. Polyurethane can be made of polyurethane coating agent, it contains hydroxyl groups by polyester urethane polymer iso coat acid phenol functional groups of crosslinking.

Am wondering what possible problems might be encountered.

Is anyone familiar with this finish i agree, shellac, done in the old way is a beautiful finish, but not very durable. I can not easily answer your question. A wide variety of synthetic forms are made and used as adhesives or plastics or paints or rubber. Polyurethane can be made of polyurethane coating agent, it contains hydroxyl groups by polyester urethane polymer iso coat acid phenol functional groups of crosslinking. Why use shellac under several coats of polyurethane — or under any other finish? By woodbutchr04, march 17, 2013 in finishing. Start date sep 25, 2010. I've had this problem before but never got a good answer for it.