(hint #1) Being able to play whatever I want has been a central theme to my own discovering how to play guitar. I've been on that path for 37 years, and it's enabled me to uncover, test and refine a unique, skill generating learning approach.
It is important to note that urethane foam is most commonly used to refer to a material made from polyurethane. The urethane reference in this name is to the type of links, also known as carbamates, that join the units in polyurethane.
Polyurethane (a.k.a. 'Urethane') Polyurethane (also known as simply urethane) is a popular material for body kit parts. Because polyurethane is more difficult and costly to produce, parts made from it are more expensive to purchase. However, the as-delivered fit and finish level is usually better than fiberglass.