But while polyurethanes are made up of several different urethane compounds, there are many more differences between polyurethanes and urethanes. Although the main difference is the compounds (polyurethane is basically a chain of urethane organic compounds, and urethane has a main functional group of compounds). Acrylic urethane differs from polyurethane in several noteworthy ways. For one thing, polyurethane chips and stains less easily than acrylic urethane.
Compel, impel agree in the idea of using physical or other force to cause something to be done. Compel means to constrain someone, in some way, to yield or to do what one wishes: to compel a recalcitrant debtor to pay; Fate compels us to face danger and trouble. Impel may mean literally to push forward, but is usually applied figuratively, meaning to provide a strong motive or incentive toward a certain end: Wind impels a ship.
Laymanâs description (not a legal description) of what estoppel means in a condo or homeowners association: an estoppel certificate is a document which describes outstanding fees that an owner owes to his/her association as of a certain date.