Sealer Choice 15 Stone Sealer Question

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
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miamicuse wrote:

Was the bottle 'sealed' well? Pun intended, but obviously the top should have been on tight.
The stuff's water based. I'm no chemist but according to AM it should have appearance of straw yellow. Stored properly it should last for a long time. Shake well before use. I've never seen an expiration date on the bottles.
Aqua Mix 1-800-366-6877
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G Henslee wrote:

PS, Everything I've read about sealer(s) shelf life is 1 year in an unopened container.
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expiration
OK here is the mystery...after I put on my glasses...don't laugh...on the bottom it says "Last Up To 15 Years!". Now I assume it does not mean the sealer after being applied to the grout can last up to 15 years? It recommends resealing every six months or so. So does it mean the sealer can last up to 15 years in the bottle? Does not jive with your one year shelf life comment. I am confused.
MC
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miamicuse wrote:

Coverage: Approximately 400 to 1,500 sq. ft. per coat per gallon, depending on type of stone, porosity and texture of surface, temperature, humidity and method of application.
Expected Wear: Will vary depending on hardness and texture of surface, type of area, surface wear, frequency and type of maintenance products used. Expected wear is up to 15 years. Extreme weather conditions, harsh cleaning methods and high-alkaline or solvent-based cleaners will affect wear.
*Call the number.
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