Like Bjaardker, I've always wondered what's in Hook-It. I use loads of it, but it makes me a little nervous. I wear neoprene gloves when I apply it. The way it dissolves some plastics caused me to exchange a few emails with Neotac about it. When I got around to asking about what possible harm could come from long term skin contact, the email replies from them stopped. Maybe we should request Material Safety Data Sheets.
I posted here on the board when I started emailing Neotac about Hook-It, and I remember several people expressed interest in finding out more about any possible health effects from using it. I promised to report here what I found out, but Neotac never got back to me about it. I probably should have pursued it, but I didn't. I just keep using the gloves.
To get back to the initial topic, it is legal to use Hook-It DURING ABC play, but I don't know if Hook-It is advisable on regular urethane. It probably is. DON'T use it on plastic, however!
Shiv