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Discover How to Apply Auto Primer:
Part of the Bodywork Repair Process.

Steps include:

Mixing Auto Primer
Filling your Automotive Spray Gun
Applying Auto Primer
Applying Automotive Paint Guide Coat
Sanding Auto Primer
Removing Paint Masking Paper, Surface Cleaning ready for Paint Application

Primer products are used generally on parts of body work that have sustained repair work or have very minor or shallow sheet metal scratches.

Never use primer as a substitute for body filler. Any layers that are applied too thick will shrink making the sanding scratches and other imperfections even more noticeable.

How to Apply Auto Primer
1. Mixing Auto Primer 

Carefully mix the primer to ensure a proper application is achievable. Using a calibrated mixing cup makes mixing primer with the correct reducer simple. Always be sure to read the mixing instructions to verify the correct ratio.

2. Filling your Automotive Spray Gun

After thoroughly mixing by stirring, place a paint strainer in your automotive spray gun cup and pour in the primer.

Never pour any kind of paint product into an automotive spray gun cup without a strainer. Strainers are usually free from where you purchase your paint. By not using one you run the risk of ruining your automotive spray gun if a speck of dirt or debris gets lodged in a passageway that you can't clean.

3. Applying Auto Primer 

Please note: With primer being sanded, there is no need to spray it in a spray booth. A clean, dust free area should be sufficient. There will be some overspray however, so the immediate area surrounding the repair area needs to be masked off, be sure to tape any seams in the masking paper.

After you have successfully sanded smooth a top coat of glazing putty using 800-grit wet and dry sandpaper, the area properly masked off, primer mixed and loaded into your automotive spray gun and a respirator on, you can begin applying the primer.

Make sure that you always hold your paint spray gun perpendicular to the surface area being sprayed at all times, with the air line held back away from the vehicle.

When spraying the lower edges of the vehicle, it is essential to bend over or kneel down so you can see what you are actually spraying; ensuring an adequate coverage is achieved.

Spray two to three coats of primer onto the repair area, leaving sufficient time in between coats for the primer to dry.

Don't spray primer all the way up to the paint masking paper, as that would create a harsh line at that point. Instead, taper the primer from a heavier application on the actual repair area to a very thin dusting before reaching the masking line.

The use of Seam Sealer

Many panels such as doors are made up of an outer skin lapped over an inner panel or framework.

Where these panels overlap, apply seam sealer to prevent moisture from seeping between the two panels and causing a rust problem. Apply seam sealer after all bodywork and sanding has been completed but prior to applying sealer.

4. Applying Automotive Paint Guide Coat

Once the final coat of primer has been applied and dried, to aid you in detecting the progress of primer sanding, spray a light layer of matte black automotive paint guide coat over the surface. Most novice auto painters should probably apply the automotive paint guide coat a little heavier.

Sanding will immediately remove this coating from high spots and highlight low spots. You don't have to find any special type of automotive paint guide coat; flat-black paint or any contrasting color will work.

5. Sanding Auto Primer

Now use 800-grit wet and dry flatting (sanding) paper to smooth the surface with.

If you find that two to three coats of primer did not produce the results you were expecting and very fine sanding scratches or a shallow low spot remains, apply a couple more light coats of primer and again, sand with 800-grit wet and dry flatting paper.

6. Removing Paint Masking Paper, Surface Cleaning ready for Paint Application

Due to the high solid content of primer, flakes of primer can easily flake off paint masking paper and land onto work surfaces. It is best practice therefore to remove masking sheets used during primer applications.

Sanding dust will get everywhere, this will require a complete cleaning with air pressure, wax and grease remover, auto glass cleaner and tack cloth before any color coats can be applied.

You can now begin masking for sealer and paint applications.

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"What can I say, fantastic would not cover it. The most useful videos I have ever bought, been around cars all my life, and have a few parked outside, we have an airport travel company and now I can repair and paint them, I can save a fortune on repairs, thank you." - Reg Dugmore, Millennium Travel, Hartford, CT, USA

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"I would like to take this opportunity to thank XXXXX and all his staff in making this amazing book 'How to Paint a Car - The Written Guide' available. It helps a lot, especially for those who are trying to excel in the car painting business like me. It's given me a lot of tips and techniques on preparation ready to paint the desired color." - Troy in the Philippines

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“Looking at the video clips for the first time I’m getting a lot of ideas and info and I believe I am confident that I can do a good job.

The reason I bought this system was to have some tips and ideas on how to go about painting my whole car and also using the correct grades of sandpaper, what sort of paint, plus many different techniques in doing it the proper way. I’m absolutely happy with my purchase.

Number one benefit about this system would be mainly the correct approach in painting, fixing dents, spraying, masking, materials and tools used to perform the task. Sure, I can recommend this to anyone.”
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"It is a pleasure and wonderful to know there are people like you who have got a web site like this to help people like us who need help with our cars, to have the knowledge that we can gain from experts. I am glad that I have come across your web site and I want to thank you all for your anniversary sale at such a low price. Happy 1st Anniversary and may you have many more. Excellent work guys you deserve an A+." - Peter Stephens, Perth, Western Australia

"I restore Austin minis and do all the work except the paint and I wanted to try the painting as well for the experience and the cost saving. I am very pleased with the information provided. I am a beginner. Never painted a car before. By studying 'How to Paint a Car - The System' I was able to successfully carry out the required work to my vehicle. So far I have primed two cars and painted/clear coated one car on the underside/firewall. I got an excellent result the first time. The number one benefit of this system is being able to see how a professional does the job. I would recommend this to others." - Mandeep Jawanda, Quesnel, British Columbia, Canada

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