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Block Sanding Tips

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Primer surfacer is applied to the damaged area to provide mil thickness to block sand. It is like a thin filler to fill in scratches and other minor imperfections before you spray paint. In this video, I am going to demonstrate a few block sanding techniques when sanding primer surfacer.

For more information about the sanding block mentioned in this video, visit www.CollisionBlast.com/SandingBlocks

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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BCC Student Demonstrates Block Sanding Primer

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In this video we are demonstrating how to block sand primer surfacer.

1. Apply guide coat to the surface.

2. Using a block and 320 grit sandpaper, cross sand the surface.

3. Sand the surface until all guide coat is sanded off. If you sand through the primer surfacer and the epoxy, you will need to re-prime and block.

4. I all guide coat is sanded off and no filler or metal is showing, then you are ready to unmask.

5. Using a smaller block, sand the harder to get areas and all edges.

6. Using a DA, inter surfacer pad, and 500 grit sandpaper, sand over the surface where sealer and paint will be applied.

Now you’re ready for final prep and masking for paint.