If a tire manufacturer says the tires are safe for my car, then who am I to argue with them? If the tires prove to be unsafe, the liability rests entirely on the manufacturer that made the claims and not the shop that installed them.
Bainbridge has made the claim that the mounting is reversible and archival. After some experimentation, I agree with their claims. They even go further to have a specific list of items that should and shouldn't be mounted with Restore and there is some notation about RC photos if memory serves me. Many of those items can or could have significant value (LE Prints is one listed).
While I totally understand the "error on the side of safety" approach, its just not practical in the day to day running of a frame shop. Artcare restore seems to be a great compromise. Sure there just isn't enough information to accurately judge the long-term effects. That’s fair but I think that if there was a significant risk then they wouldn't make any claims at all and leave the Framer at risk of slander.
Instead they say:
“With Artcare Restore, you can safely reverse art to its exact, pre-mounting condition. The non-permeable adhesive meets all archival standards and can be completely removed from the art. Artcare Restore’s breakthrough adhesive activates at low temperatures and short dwell times, making it safe for most art….Artcare’s patented technology actively protects art from the harmful effects of outgassing and from damaging pollutants—something no other foamboard can do!”
It not only sounds safe, it sounds actually good for the art. From what I can tell, the very worst scenario would mean that the art would have to be taken to a skilled conservator that might actually be glad to see it mounted to Restore as opposed to duct taped! Thankfully we have some really good conservators. If the Mona Lisa has held up as well as it has on crappy wood then surely this foam board won’t be the total demise of art.