Does self leveler go out of date?

Things to consider when using a self-levelling compound to fix uneven floors

Always remember that a 'smooth' floor isn't necessarily level, and a 'level' floor isn't necessarily smooth. The British Standards relevant to the flooring industry specify a &#;surface regularity&#; - this is a measurement of a floor's smoothness, not how level it is.
 
If slopes in the floor are particularly pronounced, you may need an alternative solution as most self-levelling compounds are designed to work at depths of 3mm-10mm, although some deep fill self-levelling compounds can be applied to depths of up to 50mm-60mm.

Other factors to consider include where the floor is located and what conditions it will experience over its lifetime, what floor covering is being installed, and how long you have to apply the self-levelling compound.

Whatever your needs, the key to choosing the right self-levelling compound is to assess the particular application and do your research.

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Well, well... so I did a small room and a hallway in my basement. The job itself went not bad but I noticed when I was mixing the SLC it had kinda black oily spots in it... I mixed for a bit more than the 3 minutes indicated in the manufacturer instructions but also didn't find it as liquidy as I saw from the vendor's videos (which is fine).

Anyway... I started reading about some sites and found that both it is not recommended to use it past it's expiration date (had no idea cement had an expiration date). Of course, nobody say why exactly. So went to see my bags and sure enough the expiration date listed is Oct .

My question to your knowledgeable folks is this - is there really a harm in having "expired" SLC underneath your subfloor? Will it crack with time? Will it sink? Will it be less durable?

I will replace the remaining bags to complete the jobs with stuff that is less than 1 year old, but should I remove already applied cement and re-apply?

Thank you much

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