Understand Lap Marks and Acrylic Build-up
At 0:06 in
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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What they say
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