Please check this with an archaeological conservator first, as they have
the best data on the lifetime of polyurethane foam and it is not very
long. It also has the potential of releasing undesirable breakdown
products. Many people have used this because it sets in place as a space-
and gap-filler, but it is a short-term solution to a long-term problem
and the headaches may outweigh the immediate benefits. I believe that
exposure to UV sharply decreases its useful life, too. Please, again,
talk to an expert first.
Sally Shelton
Director, Collections Care and Conservation
San Diego Natural History Museum
 
On Fri, 28 Oct 1994, Robert O. Dahl wrote:
 
> Try one of the spray-on polyurathane foams. You can buy them in small
> cannisters and they are easy to texture ( with knives and drill bits) and
> come in different densities. You can also mold from a cast if you wish.
> Robert