The original company Voss ltd was taken over by Rustins. Rustins still make the original Bondaseal Clear, but are very busy at the moment. They have suspended activity via their website as they are extremely busy but will be back on line in about 3 weeks. The product can still be sourced via other companys etc and is not in short supply.
The blue tin Prymax is a CFS product and it looks like a cheap copy.
Hope that helps.