Building parts made of modern moldable materials are becoming more common in
preservation and restoration projects and in new construction. Standard and
custom parts are made from Fiberglas reinforce polyester, polyurethane foam,
polyester resin with marble dust aggregate, and other materials.

What is your experience with how these various materials hold up in service?
How long can they be expeced to last?  What are the mechanisms of failure?
What maintenance is needed to prevent failure?

All things considered, should I stick with traditional materials or begin
turning to these new materials?

John
by hammer and hand great works do stand

John Leeke, Preservation Consultant

publisher:               Practical Restoration Reports
website:                  www.HistoricHomeWorks.com