Dont prick them!.. i had mine done by TINT - R he said the small bubbles are nothing to worry about.. but if u have a heated rear window.. dissconnect it.. because if in use.. the heat will make the air get wider and it will expand the film.. causing bigger bubbles to appear.. i had to leave all my windows up and not use the Heating system for 5 days.. i did have small bubbles in the back.. but after time they do dissapear.. Sun does help it slighty as it drys it off quicker.. but even if its shitty britain weather they will go down.. be patient m8..