Hey, Rusty!
Right...update!
Having scrubbed and thoroughly dried my welly - I had almost forgotten that they were green! - I have now applied the glue!
The kit came with a choice - to use a self- adhesive patch (two were supplied) OR to use the glue by itself.
I have opted for the glue - as shown in the videos on YouTube, and as advised in the accompanying instructions should the area be such as a seam or where a 'bend' might occur in the rubber.
I filled the crack with the glue , then added an additional rim of 5mm glue as told.
Seemingly, it should be "touch -dry" in 2 hours, but must be left for 10 -12 hours before wearing the boot.
My husband insists it won't work!
I think it might! ( the videos were impressive!)
Maybe I should take bets......?
I have put said boot in one of the bedrooms ( it has to lie undisturbed on its side; almost like a surgical operation! ) and I am not going to check on its progress until tomorrow lunchtime!
(If I can be so strong -willed and don't give in to temptation to peek!)