"Original Formula" Weldwood is very similar to the old formula Barge. The newer formulas of Barge are becoming more and more uncertain with regard to chemicals like Toulene being removed. I am considering the switch to Weldwood when my current supply of Barge is exhausted, assuming the "Original Formula" is still available at that time.
My biggest concern is finding a good thinner that will work with the Weldwood. I think straight toulene will work and possibly methyl ethyl ketone, both of which are available in the paint section of many hardware stores and both are present in the formulation of Weldwood.
I use my Barge, Weldwood, or whatever at a consistency that many would consider too thin, but I find I get a much better bond and better overall results using the thinned down product. I probably wind up using a gal. of thinner to every gal. and a half or so of cement. This is mixed a small batch at a time in my teflon glue pot. The glue pot is available from Tandy and others and is relatively expensive, but I have used the same one for years and it is very handy and surely beats the small bottles, cans etc.
Paul