 Sometimes clients ask me, if I first apply a protective base layer on my nails, why can't I build a structure with bicolor? Well, first of all, bicolor is a highly pigmented color and it's meant to be applied in a very thin layer that covers perfectly. So if you were to use more product and build, construct the nail, it simply wouldn't cure. Even if you were go 10 times in the lamp, this would not help. Another thing is that even if it would cure, it would still not have the strength of a real construction gel like B-Flex or B-Strong, simply because of the chemistry and all the pigments which are less strong than a real polymerized builder gel.