After spending roughly 25 hours on building my first ft plane, the Edge 540 I have now spent probably 15 infuriating hours on the painting. I began with roughing up the paper on the foam with sandpaper, as said in the painting video by ft. I then moved to painting. The spray paint goes on fine and looks good and then when I mask over it, the paint flakes off when I remove the masking. I have tried several times with different kinds of masking tape including low tack and different kinds of paint to stop this from happening but nothing is changing, it keeps peeling off. I am aware that I'm throwing money at it now and I am constantly adding weight with every coat and I am getting a little tired and frustrated with it now. Could anybody help me with what I am doing wrong and how I can prevent this from happening.