lamination question

[Basketcase]

Hey all. I've had an issue that may or may not be a big deal. Im using 1708 and vinyl ester to raise my stringers. Its a 4 stringer 20. So far I have one complete but in certain spots the glass is slightly white like there's air in there. They are small spots and not many of them but I just have to ask. I know that I originally got plenty of resin in there. I used the squeegee and worked the resin bubble back and forth many times before removing the excess. Could it be a viscosity thing and resin is draining out after I leave it? Thicken with cabosil just a tad? Ill post up a pic of what I mean but I suspect you may understand already. I've been doing fiberglass for years and never had this happen. Any input? Thanks!