Today, synthetic polymers derived from petroleum are mainly used. The mass exploitation of petroleum raw materials causes global climate change. Moreover, they are available only in limited quantities and are also non-degradable, leading to the accumulation of packaging plastic in the environment. For these reasons, the development of biodegradable and environmentally friendly biopolymers is the subject of numerous scientific works. In this work, the properties of coatings made from blends of shellac and polyvinylpyrrolidone (PVP) with different molecular weights prepared from an ethanol solution with the addition of glycerol (G) and polyethylene glycol 4 000 and 12 000 (PEG4, PEG12) were studied. The coating samples of the blends SCH / PVP / G, SCH / PVP / PEG4 and SCH / PVP / PEG12 were investigated for their thermal properties by differential scanning calorimetry, thermogravimetric analysis and thermal conductivity measurements and for their surface properties by contact angle technique. The morphology and relaxation mechanism were monitored by scanning electron microscopy and the barrier properties of the coatings were determined by measuring the water vapor permeability. Significant dependence was found on the composition of the polymer blends and the addition of glycerol plasticizers, PEG4 and PEG12 polymers. PEG4 and PEG12 polymers showed a compatibilizing effect in blends with a lower proportion of PVP polymers.