Whey protein isolate coating films was reducing fat uptake more than whey protein for all levels. Dogan et al. (2005) reported that, the potential formation of intermolecular disulfide cross-links in whey protein films might have improved the barrier properties of the WPI-added batter for water vapor. The reduced oil uptake may also be related to thermal gelation and the film-forming ability of proteins. The oil content was found to be correlated with the moisture content (r=0.89). Previously, a linear relationship between oil uptake and water removal had been reported (Dogan et al. 2005). Dragich and Krochta (2010) concluded that whey protein isolate film combination gave good fat reduction in the fried product,. They hypothesis that the whey protein isolate film modifies the surface structure of the product by filling pores in the surface which would otherwise provide a route for oil ingress. Alternatively ,the larger moisture content of the whey protein isolate film increases the surface tension with the oil, contributing to less fat uptake. Also Salvador et al. (2008) reported that, the fact that water vapor leaves voids in which the fat subsequently enters is the reason why fat uptake is largely water retention properties. García et al. (2002) reported that the reduction in oil uptake and moisture loss to the formation of a protective layer on the surface of the samples during the initial stages of frying due to thermal gelation. This protective layer inhibits the transfer of moisture and fat between the sample and the frying medium. Coating integrity is an important factor because the presence of cracks may reduce barrier properties of coatings and may limit coating applications.