I just opened a new tube that appears to be amber-brown in color. It appears to be working correctly but my last tube of this adhesive, I believe was almost clear material. Shelf life on box states 1.5 years but there is no mfg date on box or tube. I have spent a fortune refurbishing an antique SR and I do not want any leaks. Quicksilver may have changed formula, or I may be remembering incorrectly. Anyone else used this adhesive and if so, what was color? THX!