ILUVMILS --- Ok, my order arrived today and I put a gob of the new MB sealant on my work bench next to a gob of the old MB sealant. I also smeared a thin layer of the old stuff next to a thin layer of the new stuff.

Right out of the tube, the old MB sealant is very glossy in color - looks wet. The new tube of MB sealant is kinda matte in gloss. In about an hours time, the new stuff is really tacking nicely --- firming. THIS is what I've needed!

I think my old tube was just old, and something must've happened to it chemically. For my new tube, I'll keep plastic wrap over the cap/end, to keep the air out. And I'll keep it in the house instead of the garage.

BTW - the part number on the old and new containers are as you listed.

Thanks again.