The screws used will be metric screws, specified in diameter and treads per millimeter.
Pentalobe screw heads are used where User access is discouraged. You are far more likely to find an ordinary Phillips-head screw the right diameter and length that will do the job just fine.
The blue stuff sometimes seen is thread locker compound, sold at retail in the US as Loctite™. It is color coded.
Blue is for smaller screws that might need to be removed. Red is more commonly used to retain larger automotive engine bolts, such as Head Bolts. When Red is applied to tiny screws, they can be very difficult to remove without resorting to drillling out the fasteners.