What is the difference between primer and etch primer?
What is the difference between primer and etch primer?
A zinc-rich primer should be used as part of a heavy-duty, high build, two-pack system. Etch primers work by acid etching the metal surface. Therefore they have little effect on previously painted surfaces (including precoated sheet steel such as Colorbond®).
What is special about self etching primer?
Self Etching Primer is a rust preventive coating that etches and primes in one coat. Self Etching Primer features an advanced spray system that allows you to spray at any angle, even upside down for those hard to reach areas. A comfort spray tip with a wider finger pad reduces fatigue caused by continuous spraying.
Is self etching primer necessary?
After you remove the rust scales from the metal on your car, you need to apply self etching primer. It’s a mix of phosphoric acid and zinc. The way it works is that the acid forces the zinc into the top of the metal. It’s purely a surface coating, and it doesn’t stop the rust.
Do I need etch primer on bare metal?
Both Epoxy Primer and Self-Etch primer (Self-Etching primer) can be used on bare metal. Both provide corrosion protection, and both can be top-coated with primer surfacer.
How long can I leave etch primer before painting?
24 hours
Once applied the Etch Primer needs to be left to dry, both to allow the etching process to work and to allow the evaporation of the solvents contained within the paint. All Etch Primers need to be left for a minimum of 24 hours at a temperature of 18 – 20 degrees Celsius to dry properly.
Do I have to sand before self-etching primer?
You need to use self-etching primer to paint aluminum, but prep work is especially important. Unlike with other metals, you do have to sand the aluminum first, with 120-grit sandpaper.
Does self-etching primer need to be sanded before painting?
In any complete restoration or body repair project, you will to sand primer at one point or another. However, most manufacturers of self-etching primer, due to the acid base of the products, don’t recommend directly sanding the self-etching primer.
What do you put on bare metal before primer?
To properly prepare new metal surfaces, use mineral spirits to remove grease and apply a rust-inhibitive primer before painting. For painted surfaces that are in sound condition, remove dust with a clean, dry cloth, de-gloss the surface with light sanding, and wipe with mineral spirits to ensure good adhesion.
