Is primer necessary to use?

Basically, primer is necessary to ensure the paint adheres to the surface according to the RAL number. However, if you're spraying this paint over existing paint that is already in good condition, it is not necessary to use a primer. If you're unsure whether a bonding primer is needed, we always recommend using it! Sand off any loose paint first and apply a primer for the best adhesion and durability of the spray paint.