They can play a small part but Bubbles in L&P are not really due to incorrect mix or even air in your brush so much as they are due to the technician working the bead too soon before the L&P has had a chance to start to form up a polymer structure. Bubbles can appear in any product but the more sophisticated the product chemistry, the more you need to understand to solve issues like this one.
What I mean by this is that as soon as you mix your monomer with your polymer millions of chemical reactions start to take place. When this happens OXYGEN (AIR) is formed and released ... usually through the product and into the air .... HOWEVER if you start to pat and push the bead around excessively or too soon, you end up trapping the air (BUBBLES) inside the product before it has a chance to dissipate.
The SOLUTION is to, of course wet out your brush well first, before making the bead and then place it and let it settle (just take a breath ) and then start to gently press your product into place and then smooth over the top. You wont have any bubbles.
Doesn't understanding product chemistry help to solve your problems?????? Why not take CND Master Classes and you'll understand allot more? :green: