"Primer paint is like a dress rehearsal for your model. It allows you to see what the finished paint job would look like with out actually spraying your final paint coat. It makes surface imperfections more visible so you can treat them. Primer also provides a texture for your final paint coat to adhere to "
"Latex-acrylic based, primer paint is like a thin layer of rubbery plastic that seals the outer surfaces of your home. Primer is used as a base coat because of its epoxy-bonding agents which are designed to stick like glue. This allows the finish coat to go on more evenly and provides a thicker, more protective outer surface."