Hi, it´s happened to me twice already. I make a carbon fiber sheet and on the surface there are pores and micro pores. I do it with a glass, once with weight making a sandwich with another glass behind and again, without weight and without glass behind. Both pores have come out 

Hi! Thanks for answering! I have a bristle roller but i think that i don't use it enough. The hardener is too fast, i think i should  buy a slow hardener. I will use the rest of fast hardener by parts and apply the roller much more!