How to know if you need primer for BallistiX?

BallistiX does NOT require a profile. If it's clean, it'll bond. Period. The grind and seal is extremely easy - it can be done one of two ways. First start off with a quick tensile test. Take a cup of water and dip your finger tips, spritz around your jobsite to create small areas of

beaded water. Count how long before the small beads dissipate. A rule of thumb is 0-15 seconds? You're definitely going to need a primer. 15-30 seconds? Primer may be required, but generally you are fine without, but will require more product than over a tight surface. Greater than 30 seconds? No primer needed.