Grinding before self-leveling - DIY & Professional

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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For more information, please visit Self-Leveling Compound Manufacturer.

Moisture-Resistant, Water & Frost-Resistant Cement-Based, Self-leveling Compound suitable on cement and gypsum-based substrates. Can be installed from 1/8&#; up to 3&#;. Up to 40 min. pot life. Ready for covering after approximately 24 hours at 1/4&#;. Designed for fast leveling in interior and exterior areas.

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