if u mean bubles yup i did face that problem but i solved it depending on the quantity of it , i sand it from 120 till 2000 then i clear coat it and it works real fine , some times i used to sand it 2000 again until i level things up next day and re coat it .

also i added a material i dont know its name  in english which is sold to make polyester more liquid and this resulted in more tha 70% less bubles sometimes no bubles.

hope this will help

best regards mhd alghoul mhdghoul@hotmail.com youtube channel :atmospherejo link is http://www.youtube.com/user/atmospherejo?ob=0&feature=results_main

Have you encountered many water absorption issues? or do you coat everything in gel coat/ lacquer

guys , istarted since 3 years doing carbon overlay with polyester resin , and i never used epoxy because we dont have it here , if anyone ants anything to do with polyester resin i surely can help and by the way i started doing infusion too with it and its doing fine.

best regards mhd alghoul mhdghoul@hotmail.com youtube channel :atmospherejo link is http://www.youtube.com/user/atmospherejo?ob=0&feature=results_main