I want to pour pen/shaving brush blanks using clear pour slow. Can I make one pour, pressure pot it, then pour more on top of this, pressure pot it again and have both pours bond to each other? Idea is to keep colors completely separate.
Yes it will bond. Resin, like silicone, bonds well to itself. I've personally poured more resin on top of cured resin to make a complete casting when I didn't have enough in the mold on the first pour. I've even mixed resins - like poured RC-3 first, then Clear then Amazing Resin White all in different layers in the same mold and had no problems so laying Clear shouldn't give you any problems.
Now that's just pouring without using a pressure pot so I'm not sure if using one will change anything - can we have one of our pressure pot users chime in and be sure if there will be any problems?