You can use primer spray paint on all surfaces. Applying primer is a vital step before you use spray paint and a good way of preparing the surface for the paint. When you’re looking to buy primer spray paint, there are a number of things you need to consider to make sure you have the best product for your job.
When Do You Need Primer?
Primer helps paint adhere to a surface as it forms a layer that binds to the surface more than paint can by itself. Primer can also fill in very tiny imperfections in the surface, making it smoother when you do paint over the top.
Primer is very good when used on porous materials as it will stop the paint soaking into the surface and help maintain a better finish. It can also give a good seal to items like drywall. If you’re going to finish with a dark color, you should look for tinted primer spray paint. The effect of this will be to reduce the number of coats of paint you’ll need to cover the primer.
Not all metal will need primer spray paint before painting. If the metal is outside or in a place where it will be exposed to moisture, you will need to use primer spray paint on it. This stops water getting to the bare metal and some primers will have chemicals to help stop corrosion. Some metals, notably oxides, don’t take paint well,and it will flake off. Using a primer made for metal will stop this happening. Also, if you’re painting aluminum that hasn’t been treated, a primer is vital before painting.
If the surface of the metal isn’t in good condition, you need to use metal primer. If there’s rust and you’re not able to clean it, buy a special kind of primer spray paint that can convert the rust into metal salts prior to painting. It won’t be perfect, but it's better than trying to paint over rust.
If you’re going to paint plastic, the only time you’ll really need to use primer is when you’re covering dark plastic with light paint. Using a primer will mean you’ll need fewer coats of paint to complete the job. You need to be sure that the propellant in your primer won’t damage the plastic. It’s important to choose a primer intended to work with plastic.
The porous quality of wood is the most important reason to use primer. It’s best to spend a little more and buy a good quality primer spray paint for the wood as it will bind better and lead to your paint adhering correctly.
If the wood is outside, using just paint means the water can still permeate through to the wood. Primer will seal the wood and stop this happening as well as making sure no mold or mildew form. Primer will also mean that you’ll need fewer coats of paint to properly cover the wood.