The distance of migration is inversely correlated with the molecular weight of the protein (small proteins move faster through the gel than large proteins do and therefore migrate further down the gel).
Shellac is the most expensive of the gel nail polishes on the market, and the bottles are half the size of the competition. The higher cost for the salon owner is one reason Truong believes other salons might not correct you if you ask for Shellac but choose a different gel polish when picking your color.
Geer explains that Gel polishes are similar to nail polish - you have a base coat, polish color and top coat. Each coat has to be cured in the UV light for two to three minutes.. Both types of nails undergo chemical process to bond to the natural nail, however, there are some differences between the two.