Hi All
I'm about to start tiling on some STS ceramic foam backing board, primed with SBR using 600 X 300 x 10mm
Porcelain tiles.

The plan was to use the 4 bags of Dunlop CF-O3 that have been kept dry inside a heated house and
is now a year out of date. Bags look good, all as bought and visibly looks no different. 

So the question is will this be ok to use?

Current price is £40 a bag and have 4 of them so could be £160 wasted  

I'd mix up a small test qty. Try it on some scraps.

Dating probably just to maintain published hazard data:

 

DUNLOP CF-03 FLEXIBLE FAST SET ADHESIVE GREY
Hazard statements H315 Causes skin irritation.
H317 May cause an allergic skin reaction.
H318 Causes serious eye damage.

H335 May cause respiratory irritation.