Collision Blast

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Common Cause For Paint Mottling and How To Eliminate It

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Paint mottling is something that many painters have had happen to them. If you’ve done any auto painting, chances are that you have had paint mottling.

Mottling is where for the metallic gathers together in areas or bunches together and gives it uneven or blotchy look. This is usually caused by spraying the base coat too wet resulting in the metallic flakes moving around bunching together. Mottling can also happen spraying pearls.

[youtube]http://www.youtube.com/watch?v=VJ2BgJC1BdE[/youtube]

This can also be caused by using the wrong reducer, however spraying the base coat to wet is the most common cause that I have seen. To eliminate this problem, spray your base coat with medium wet coats. If you are spraying your base coat and you are achieving a glossy or extremely wet coat when spraying, you are probably spraying too wet. Ways to spray a medium wet coat if you spraying too wet could include: decreasing fluid, moving faster, or holding the gun further from the surface being painted.

Watch the video for a few steps that would help you eliminate having this problem.

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5 Tips To Clean a Spray Gun With Only 2 oz. of Cleaning Thinner

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This year the EPA enforced the 6H regulation, which required paint technicians to develop a way to clean their spray guns without spraying any of the thinner into the air. The purpose of this restriction is to reduce them amount of VOCs that are released into the environment.

In this video, I am demonstrating to the students how to clean a paint gun without using oar pressure to spray the thinner through the paint gun.

We found that a spray bottle with cleaning thinner work well for this. Here are the steps to hand clean a paint gun, while only using 2 oz. of cleaning thinner.

Tips

1. Pour remaining material in approved storage container or recycle system.
2. Press the fluid trigger and spray thinner through the gun using a spray bottle. If you are using a traditional cup, spray the sidewalls of the cup first. Have a container available for the waster thinner to gather.
3. One the stream is clear, take the fluid nozzle of and clean the nozzle and tip.
4. Spray thinner on the gun and clean with a towel to remove any final material.
5. Screw the nozzle back onto the gun and blow gun with compressed air to dry and assure that it is clean and ready for storage.

That is it! It only take a minute or two and use less than 2 oz of thinner. If cleaning a traditional cup, it may take slightly more cleaning thinner.

Minimal time and thinner used, and no VOCs sprayed into the environment.

 

 

Collision Repair Training – Spraying Epoxy Primer

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Why Use Epoxy?

Epoxy is used first as it has excellent adhesion and corrosion resistance.  The epoxy blankets the metal, which does not allow any oxygen reach the metal.  Epoxy also adheres (sticks) good to the metal or other substrate and top coats adhere good to the epoxy.  Therefore, epoxy is a good choice to use on repair areas where there is exposed metal or body filler.

What Epoxy Is Not

Epoxy does not have high build or fill imperfections well.  Therefore, epoxy is not designed to be applied and block sanded.  If there are still scratches or areas where body filler was applied, you really need to apply primer surfacer on top of the epoxy primer.  We’ll discuss that in another video.

In this lesson we are going to learn how to spray epoxy primer onto the repair area. Here is the process step-by-step.

1. Wipe the repair area clean with wax and grease remover.

2. Clean with tack cloth – A used one will work fine.

3. Always Used Proper PPE When Using Paint Products

4. Mix Epoxy Primer – Remember that you may need to wait an induction time before using.

5. Spray 1 – 2 coats onto repair area.

6. Allow To Flash (dry) for 15 minutes between coats.

7. Allow to flash for 30 minutes before spraying primer surfacer.  JP serious epoxy primers MUST be scuffed and reapplied if sit more than 3 days (72 hours.)

8. Clean Primer Gun and Mix 2K Primer Surfacer.

Now the repair area has epoxy primer applied, now you’re ready to mix and apply primer surfacer.  Note:  You do not sand epoxy primer before applying primer surfacer.  However, primer surfacer must be applied within 72 hours.

 Resources Below:

  • DeVilbiss Paint Gun 1.8 – I think the spray gun I was using in the video has been discontinued.   However, since then I have tried the new 3M Accuspray and it works great as a primer gun as well.
  • 3M Accuspray Prime Gun 1.8
  • Wax and Grease Remover – Wax and grease remover is an important step.  Every line of point has wax and grease remover.
  • Tack Cloth
  • Respirator – Do not sacrifice your health.  Paint materials are not to be taken lightly.  Always use proper protective equipment.  Especially and approved respirator.
  • Shopline Technical Sheet – This is the technical data sheet for the primer I used in the video.  However, a different brand will have different recommendations.  Therefore, use the technical data sheet for line of products you are using.



Check Out The Full Lesson About Prepping, Priming, and Blocking

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