Gasket maker

[GoldOxide_imp]

Yesterday, one of my tech assembled a complex engine using Permatex product that should fully cure within 24 hrs.
He came back to work today, and after 18 hrs sealant is still wet, not even tacky.
We use this company products for decades and never had a single problem with sealing/tacking or anything.
He was totally p'od, as this particular job took him 6 hrs, so we sent him home to relax.

Meantime, I did a test of the same products from four different tubes:
* an old/opened good sealant & unopened, both grey tubes, R-side pics
* the sealant he used & unopened, both black tubes, L-side pics
After couple of hrs, the grey tube sealant was curing satisfactory, unlike the black tube sealant was still wet.
The black tube sealant he used to seal his engine parts still wet after 34 hrs.

Both product have the identical OEM part numbers and bar codes, however the "serial or production numbers" at tubes bottom are different, but I do not think it matters. Both sealant substance is of the identical grey colour.
At this moment there is no more info/Saturday, and we will resume our inquiry on Monday.
I am thinking of some technical glitch, like missing hardener/curing ingredient during production process...counterfeit....or ?????
So if you doing a complex or big jobs with this product, do yourself a tacky test prior to avoid doing it twice and wasting(?) your time.
Hope to update this thread next week.
If you have any info/thoughts, share please.

After four weeks there is no update at all, as the Permatex head office has never responded to our email

Totally unacceptable. The corporation needs to held accountable for wasting consumer's time with a substandard product release.