OK this is probably a stupid question...when a neighborhood hardware store when out of business few years ago (because of a giant Home Depot nearby), I got some good deals when they had the final sales. Got a great cordless drill, some battery packs, some good quality drill bits...and then I saw a bunch of Sealer's Choice 15 Stone Sealer sitting there. Those are expensive grout sealers I used I remember a small bottle was like $27.00. They were marked down to $6.99 and they were really excellent grout sealer. So I bought six of them, and of course I had them sitting a shelf in my garage. I opened one and used it here and there. Yesterday I had to seal my shower I opened a new one. Instead of looking like "clear" water it has this brownish color, you know sort of like rusted a bit. Not very brown, sort of "hard water brown".
I then started to think does these things expires? It has no expiration date on it, but may be it can change chemically over time. I know paint, wall joint compound, primer, polyurethene, shellac etc...will deteriorate, but does grout sealer do? I wonder if I should throw them away or is it still good? That's a lot of high quality sealer to throw away man!!!
Thanks,
MC