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Understand Lap Marks and Acrylic Build-up

0:06
6:59
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3 Airless Spraying Tips. Paint Sprayer How To from A to Z

What happens here

The speaker addresses an issue reported by a customer regarding visible shiny spots, or 'lap marks,' that appear when paint is overlapped during airless spraying, particularly on aluminum siding. He explains that these marks are caused by an uneven build-up of acrylic in areas where spray passes overlap or where spraying starts and stops. On non-absorbent surfaces like aluminum, the excess acrylic is more visible, while on absorbent surfaces like concrete or wood siding, the base material can soak up some of the acrylic, but overlaps will still be noticeable. These issues can become more pronounced over time as the paint fades, leading to an inconsistent finish.

Goal: This step introduces the common problem of lap marks and excessive acrylic build-up when airless spraying, especially on surfaces like aluminum siding, and explains how these issues arise from overlapping spray passes.

Tools and materials

  • Airless Sprayer (general)
  • Aluminum Siding
  • Concrete Siding
  • Wood Siding

What they say

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right, here we go with three tips. Spraying with an airl. I've got aluminum siding. I did get um somebody contact my store, sent me some pictures, and they were getting lap marks, these shiny spots where they were overlapping, and I'm going to discuss what causes that, how you can resolve that by three simple tips. Airless spraying. If you haven't subscribed to our channel, hit the subscribe button, hit the notification bell next to it. That way, you get notified every time I come out with a new video. It's just a simple way to help support our channel in making new free videos. We're never going to try to market to you. We've never have in 10 years, and we never will. Just a simple way to get an email every time I come out with a new video. So, here we go. We got um aluminum sighting right here that we're spraying. And one thing, the gentleman that sent the pictures in, he had some lap marks. And every time you overlap on aluminum siding or really any type of structure you're getting to or having start and stop marks, you're getting a build of acrylic right there in that in that area or where you're overlapping. It's heavier there than the rest of the structure that you're spraying. And what happens is you will notice that over time as it begins to fade or wear out the paint because you got more acrylic in one area than you do the rest of the areas. And on absorbent structures, um, like concrete sighting or wood sighting, it's going to absorb some of the acrylic out of the paint out in the field, but where you overlap, it's going to be built up and you will see that. You could see that even the next day like the gentleman that sent in the pictures. I'm going to give you three tips. This is going to be one of those situations. If you have overlap marks, you could get acrylic build and you could see those um spots. So, one of the thing is choosing logical start and

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