liquid mask help

[hammerhead]

right i have a brand new jar of the bob divley stuff here and ive given a shell 5 coats of the damn stuff each time its dried before applying the next coat im doing it in thick but not so thick it laves clumps its been left over night in the airing cupboard and is ready to cut.
thing is when i cut it and go to peel it is like its only had 2 coats thinly applied not peeling properly has any one else had this problem with this brand?
i had a shell that was allready masked but was with a green masking and i found that to be a lot better but unsure of what masking that was.

steve