it's Beeswax and silicone.(period)
 If it is/was just beeswax.(?) How does it stay in a paste form?
 If you read all of MSDS, you will find a shrt sentance that say's  "and other ingrediants"  , there is a listing of #(numbers) of those ingrediants,,that statement is to protect "copy-right".
 If a full listing of ingrediants of any product  listed by MSDS was avalable to us,,,,why would we buy the product??? With a true listing of the "recipie" we could all just make our own,,and sell it as compitition to the maker of sno-seal. Maybe call it Snow-seal,,,,,,,,
 you will find in the MSDS a "time weigted-average to exposiour" and that  as tested in California' a "carsonogenic suspect" as tested to lab rats,,
p.s. stuff works great! on my boots,,my gloves,,just about everything I make with tanned elk or buckskin,,I much perfer sno-seal to mink oil to treat and care for any of my leather products,,been using it for 30 years!
 And believe me,,,,if the stuff made a good patch-lube,the guy's that sell it would list "patch-lube" on the side of the jar, and we'd find it on the shelf at the local gun shop!
p.p.s. part of my employ as a chemical process engineer is to deal with haz.mat..where did you find a Material Saftey Data Sheet on Sno-Seal??