Receiving Helpdesk

what is acid etch primer used for

by Turner Swift DVM Published 3 years ago Updated 2 years ago

Chemical treatments in the form of acid etch primers or solvent-based primers have been used extensively to enhance adhesion to a number of different plastics, although most of this work has focused on paint adhesion. Chromic acid and sulfuric acid are the most prevalent acid etch primers.

Full Answer

What are some uses of acid etching?

  • The etching process is known as biting (see also spit-biting below).
  • The waxy resist prevents the acid from biting the parts of the plate which have been covered.
  • The longer the plate remains in the acid the deeper the "bites" become.

How to Prime over etch primer?

After sandblasting...etching primer or epoxy primer

  • bri-rock. The shop that is going to sandblast my coupe only has etching primer to shoot the car with after the sandblasting.
  • Gambitt. I'd personally want epoxy...just go with a good brand like PPG or Dupont.
  • BA. ...
  • rbanks40. ...
  • Miikeremains. ...
  • sevt_chevelle. ...
  • GMJoe
  • Sid69Z's. ...
  • CDJr. ...
  • 1yrat69. ...

More items...

Does acid etch primer stop rust?

Yes the acid in the etch primer eats away the microscopic rust that you may not get with sanding, but mostly is a cheap insurance. I always use quality Dupot product and the manufacturer recomends any time you go to bare metal to use a rust prevenative which includes etch primer.

What can I spray over 'self etching' primer?

  • Application Humidity Level Less than 60-70%
  • Application Temperature Between 60°F (16°C) and 95°F (35°C)
  • Dry to Touch 30 Minutes
  • Handle In 1 Hour
  • Paint Type Lacquer
  • Application Tips Download File

Is etch 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.

Can you paint directly over etch primer?

Self Etching primer can in fact be painted over but you need to closely follow the manufacturers application and top coat guide. As a rule of thumb Self Etching Primers need another coat of primer over them to fully seal everything up long term.

What is the benefit of 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.

What is the difference between primer and self etching primer?

Self-etching primers have to have another primer over the top of them or the paint won't adhere. It can't be an epoxy primer, but it can be a urethane primer. In the meantime, it's important to talk to your paint dealer about the time window allowed between the primer and paint topcoat.

Does etch primer need to be sanded?

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.

How long can I leave etch primer before painting?

24 hoursAll Etch Primers need to be left for a minimum of 24 hours at a temperature of 18 - 20 degrees Celsius to dry properly. Whilst this is the minimum it is advisable to allow significantly longer before applying topcoats.

Can you put body filler over self-etching primer?

0:552:54Why Can't Body Filler Be Applied Over Self Etch Primer? - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo it has zinc in the body filler that is designed to go directly to metal. Now. Why can't you putMoreSo it has zinc in the body filler that is designed to go directly to metal. Now. Why can't you put it over self-etch. You know to tell you that you know I'm really not a.

How do you apply etch primer?

1:073:58Self Etching Primer - YouTubeYouTubeStart of suggested clipEnd of suggested clipThe wet one kind of softens it up it makes it so you can you know get to it. And then the the dryMoreThe wet one kind of softens it up it makes it so you can you know get to it. And then the the dry one actually removes the contaminants. And also gets the surface cleaned and ready for primer.

Does etch primer stick to plastic?

I would not use an self etching primer on plastic as it will sink. (it does on car bumpers anyway). Try and get a plastic primer (available in any autoparts store here). Give a VERY light dusting of this (A standard aerosol can can do 4 or 5 car bumpers easy) and let dry.

Can you brush on etch primer?

Apply one coat evenly by brush, roller or spray, after proper surface preparation. Avoid over-brushing and over-rolling as Etch Primer is quick drying. Do not thin for application by brush or roller.

Can I use etch primer on steel?

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®). In fact, the phosphoric acid present in the etch primer may interfere with the adhesion of subsequent coatings, causing delamination.

Do I need etch primer on aluminium?

A self-etching primer is crucial in painting aluminum. Its formulation contains chemicals that etch into the surface of aluminum for the best bond. To apply the primer, spray it in thin coats according to the manufacturer's recommendations.

Can acid etch primer be sprayed over etch primer?

Acid and self etch are basically the same stuff. Neither will prevent rust if stored in a place with any humidity. Also some types of primers and finish can't be sprayed directly over the etch primers.

Can you use PPG NCP271 for pitting?

Spray on 2-3 good wet coats and when you sand them down you may not need any filler for the pitting. If you still have some minor pitting that needs attention, use a good filler primer (PPG NCP271) or a polyester filler.

Can epoxy be used to fill metal?

Prime with epoxy first and then do your filling. The idea is you keep the metal sealed with the epoxy which is impervious to water. All common fillers can absorb water. If something happens that exposes filler to water when the filler is directly on metal then it'll rust underneath.

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