Here's the reply from Evergreen.
Hi Crazy Jim,
Thanks for using Evergreen styrene products. I really like Ambroid. Bonding time is about the same as tenax. I think they're both methylene chloride based. In fact, if you can get your hands on on some straight methylene chloride, you'll appreciate it because it doesn't have much of an odor. I've never used IPS weld-on, so I can't really make a statement about it. MEK works good in a pinch, but it's a little slower, and doesn't evaporate as quickly (and it's odor is just too overpowering for me)
Best regards,
Mike
Evergreen Scale Models, Inc.
Phone (425) 402-4918
Fax (425) 402-7948
Toll-Free (877) 376-9099
E-mail info@evergreenscalemodels.com
Web www.evergreenscalemodels.com