Vincent, yes the good old days of Dum Dum, i have only seen it at bootsales in recent years, there are many PUR sealers out there, few that dont really affect the body work, take a look on this site
www.soudal.com i can't guarantee you will find what your looking for, but it might be a good guide, if you require a TDS on any of the products PM me, i will try and help