Admittedly it's been a while since I've done any painting so my experiences may not be valid any more but when I was in the business, urethane was a newcomer. We used a lot of Imron. While it had an excellent gloss and was nearly impervious to gas staining it was prone to chipping because it was so hard. That problem may have been reconsiled over the years. While Acrylic Enamel will chip it wasn't as bad as Imron. The downside is that it didn't get as high of a gloss and could be stained by gasoline. Just depends on what you want.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
| 
