Thanks Salopian, you are quite correct on all points. My problem with slacum is the wax component; I think it weakens the molecular chain somewhat and "softens" the end result, compared to these other product, which have no wax component, just linseed and modified polymers, that cure harder and are more durable. What say ye?
JR

Be strong, be of good courage.
God bless America, long live the Republic.