How To Fix Clear Coat Runs From Spray Painting a Car or Motorcycle - Wet Sanding + Polishing

Опубликовано: 26 Май 2026
на канале: SPANNER RASH

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How To Fix Clear Coat Runs From Spray Painting a Car or Motorcycle - Wet Sanding + Polishing

#ad Here's what we used in this video (affiliate links). As an eBay Partner Network affiliate and Amazon Associate, we earn commissions from qualifying purchases:
Wet and dry - http://ebay.us/U0RMWf
Isopon P38 filler - http://ebay.us/VTumQr
Machine polisher - http://ebay.us/juboZ2
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In this video, I show you how to fix clear coat runs with my freshly painted Triumph Bonneville T120 motorcycle tank. The tank is a 2.8 gallon US tank from an early 70s Triumph.

When I painted the scallops I did end up with some small runs in the clear coat I put over them, I wanted to try using a technique using filler and machine polishing I have seen on here.

There were three runs in the clear coat, one on each side in the red area, and one on the right-hand scallop. None of them were really bad, but I did think that I could improve them.

The one on the right-hand side of the tank, was probably the worst, so that was the one that I wanted to try using filler to help. I made the mistake of putting too much filler on as it was my first time. This meant that I had to sand through a lot of filler before I got to the runs. It was also difficult to remove the filler from the edges of the area where I had used it. In the end, it worked out well. I now know to only use the thinnest smear to cover the runs.

I also worked on the other runs without using filler. Just using a small piece of 800 wet and dry, with a small backing piece to keep it flat.

I followed this by using a machine polisher which gave a great finish. Unfortunately, I didn’t video using the machine polisher, DOH! But I am sure you can see enough of the technique.

Having done this I am now a lot more confident about addressing runs in the clear coat. This is a good thing because to get the best finish with the clear coat you have to be on the edge of getting runs :)

Whenever I am playing around with one of my projects, I always try to wear good overalls like these http://ebay.us/2LOCDG and gloves http://ebay.us/gcA4XD

For more helpful how-to guides and restoration project logs, visit our blog: https://www.spannerrash.com/