assuming you have used expanding foam before
i would experiment with 2 bits off wood lay side by side on top off paper or plastic and experiment to see if it looks ok
i think once the foam forms normaly it will be ok
shelf life off foam is governed by storage conditions [idealy indoors]between plus 10 and 30% as a complete guess
Yes, I bought a box of 5 from Screwfix specifically for the new windows I've been putting in - just a took a bit longer than anticipated, hence the expiry date!
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