Hello Michael,

You may want to look at this web  site. 

http://www.ebsciences.com/papers/papers.htm#plastic

Alternatively, I've found that
Polysciences(supplier of JB4) is very helpful in
technical support.

Good luck,
	Inka
-- 
Inka Tertinegg
University of Toronto 
Department of Ophthalmology
399 Bathurst St., MC6-411
Toronto M5T 2S8
416 603-5800 x 2850