I was trying to stick the top half of the boot to the bottom half and it stuck fine until I put the boot on and it started to bend and it just pulled apart.
APG; you need to apply the glue generously between upper and sole and then bind them together for at least 24 hours. I've done that kind of repair and it worked brilliantly. Also you need to clean the sole and upper before applying.
Thanks Atheist I'll try that next time as I still have the stuff at the back of a drawer. I go through work boots like no one's business. I think the -erm - farm effluent - rots the stiching.