Primers can be applied any way that paint can – brushing, rolling or spraying. They make most paint jobs better, including those on indoor wood, drywall, outdoor surfaces and metal. Specialty primers are made for use in high-moisture areas such as bathrooms and outdoors, with fungicides that prevent mold growth. Many of the best primers are 100 per cent acrylic for maximum adhesion and all surface use.
When to Prime?
While primer is almost always a good idea, it’s vital when new paint is drastically different in colour than what’s in place now. Are you repainting cabinets and furniture? Primer is essential here, too. 100 per cent acrylic primer allows latex paint to be applied over old oil-based paints. Oil primer is ideal for thirsty, unfinished textured ceilings.
Previously painted wood with no peeling requires no primer, and neither does previously-coated interior drywall where no major colour change will occur with new paint.