Scrape the sides and bottom of the pail while mixing. Large batches of epoxy will set up much faster than small batches. Do not use backer rod with epoxy joint sealants unless the joint is extremely wide and sand will not keep the material from flowing out the bottom. Material may be poured into the joint out of the mixing pail, but it is best to use bulk load caulk guns, squeeze bottles, or a two component injection pump. Filling the joint from the bottom up by injecting the material through a small nozzle will help eliminate entrapped air pockets.
Fill joints to full depth.
Within 30 minutes the filled joints should be inspected for low spots resulting from seepage. Top these areas off with neat material. Prime Seal 5000 is designed to crack or separate from sidewall if too much slab movement is encountered. This is not a failure of the material, but a safety feature. It prevents the concrete from being pulled apart and cracking.