Get yourselves some MSDS sheets on ANY clear you get, especially the Urethane clears. Is is NOT to be played around with, and really shouldn't be sold to inexperienced people like us. They contain icocyanates, not sure on the spelling, but look it up. It's deadly, is absorbed in through lungs, nose, even your SKIN, and no, just gloves are not enough. It's tough stuff to handle. If I am not mistaken, there is even some in Dick Nite, at least according to the definition of Polyurethane according to Wikipedia
Use what you want, but please protect yourself, I don't claim to be completely safe, but I try, as I need to be around to finish watching my kids grow up, and you should too.