Strain and Line a Sprayer Cup
Two setup habits that prevent mid-project clogs and turn sprayer cleanup into pouring the leftovers back.
Spray to Natural Breaks to Avoid Lap Marks on a House Exterior
Lap marks from an airless sprayer don't show when wet — they appear months later as the doubled-up areas weather differently. Avoid them by never stopping mid-wall: break the surface at corners, windows, and downspouts so each section goes on in one pass.
streaks in sprayed paint, stripes on siding after painting, blotchy exterior paint, banding in a paint job
The Problem
When you spray a large surface like a house exterior with an airless sprayer, stopping in the middle of an open wall and restarting leaves a lap mark — an overlapped band that's invisible while the paint is wet. The trouble shows up months later: the doubled-up area weathers differently and the line becomes visible. By then the only fix is repainting.
The Technique
The rule is simple: never stop your spray in the middle of an open field. Break the wall into sections you can each cover in one continuous pass, and put your stopping points on features where a slight overlap won't show.
- Plan your sections around natural breaks — a corner, a downspout or conduit, the edge of a window or door. Start and stop only at these lines.
- Spray each section in one go, keeping a wet edge the whole way.
- Pause only when you reach a natural break, so any overlap lands on a feature rather than open siding.
- Up high, if a section is too big to finish from one ladder position before the edge dries, set multiple ladders or move fast to keep the wet edge alive. This is the hard part on a second story.
Pro tip: Because lap marks weather in rather than appear immediately, you can't judge the job the day you finish it. Planning your sections before you pull the trigger is the only reliable way to prevent them.
Safety note: Spraying from a ladder tempts you to overreach with a gun in one hand. Keep your belt buckle between the rails and move the ladder instead of leaning, and wear a respirator — airless spray atomizes paint into a fine mist that's easy to breathe in.
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