The mica contained in the Quinto deposit is actually a naturally ground muscovite. The main application for the Quinto mica is intended as the filler in plastics, additive to paints and wallpaper as well as a sealer. Mica's application as filler in plastics largely stems from its electrical and thermal resistance and its insulating qualities. As an additive to paints, mica acts as a reinforcing pigment reducing penetration into porous surfaces, improving weatherability and brushability. Mica reduces running and sagging of paints and is an economical replacement for aluminum in paints.
Mica is also a sealer for porous surfaces, such as wallboard masonry and concrete structures.
It's use in the joint compound mixture is widely recognized. In all applications mica contributes to making a nonabsorbent smooth surface that reduces shrinkage and eliminates cracks. In oil drilling operations, mica mixed with mud additives acts as a sealant because of its platy structure. Fine particle size mica is used as a flux coating for metal welding rods. Micron size mica, preferably calcimined, is also used in cosmetic applications, i.e. nail vanishes, lipsticks, eyeshadows and barrier cream.