KOTESLLOE Paint Sprayer Parts, 50 Pcs Paint Sprayer Bags, 7.8'' X 11.8'' Sprayer Cup Liners, Transparent Spray Gun Cup Canister Liners for Wagner Paint Sprayer

A simple way to skip scrubbing your sprayer cup

A clean sprayer cup is one less thing to dread after a painting session. I tried the KOTESLLOE cup liners across a handful of small projects—fence stain, interior latex on doors, and a primer run—using a Wagner-style handheld HVLP and a basic siphon-feed gun with a bottom-mounted cup. The idea is straightforward: drop a liner into the cup, pour paint into the liner, screw the lid/collar back on, and spray as usual. When you’re finished, pull the liner and toss it. In practice, they mostly do what they promise, with a few caveats around fit and bag management.

What they are and what they’re not

These are clear, disposable plastic liners (roughly 7.8 x 11.8 inches) designed to sit inside a sprayer’s paint cup. They’re not filters and they’re not a closed-cup system like 3M’s PPS. If you’re spraying anything with chunks, you still need to strain your paint separately. Think of these as mess-prevention sleeves for conventional open-vent cups, especially on handheld sprayers and siphon-feed guns.

The material is a reasonably tough, slick plastic with a reinforced bottom seam. It’s waterproof and handled water-based coatings without any drama. The pack of 50 comes flat-stacked; the liners aren’t precious, which makes it easy to swap colors mid-job without thinking twice.

Setup and compatibility

Fit depends on your cup style:

• Handheld HVLP with a bottom cup (e.g., common Wagner handhelds): These liners fit easily. I had enough overhang to fold the cuff over the rim and keep it in place while tightening the lid. The cup’s vent path still needs to breathe, so make sure the liner isn’t covering any vent passage molded into the lid or cup.
• Traditional siphon-feed gun (metal cup): Also workable, but you need to pay attention to threads and the collar. The plastic can catch on sharp edges if you crank down too hard or if the liner isn’t neatly folded. I found it helpful to fold the liner edge down once to create a thicker “band” and then set the collar.
• Gravity-fed top cups: This isn’t the right product for those. If you’re looking for a gravity-fed liner solution, you’ll want a closed-cup system with dedicated lids and liners.

If your sprayer relies on a cup vent or a small breather hole, do a quick dry-fit to confirm the liner isn’t blocking it. You can trim a tiny notch at the liner’s rim to clear the vent path, but keep that cut above the paint line.

In use: the good and the fiddly

Once loaded, the liners behave like a flexible, collapsible paint bladder inside the cup. With latex paint, flow and atomization on the handheld were normal. There’s a bit of technique involved:

• Twisting: If the liner twists as you work (especially if you tilt or move around a lot), it can briefly starve the pickup tube and stop flow. Two fixes helped: securing the cuff with a small binder clip or elastic band, and leaving a touch of slack at the bottom so the pickup tube stays seated in a corner. Since making those adjustments, I rarely needed to pause to untwist.
• Collapse: With heavy trigger use and partial cups, the liner can collapse inward. That’s usually a venting issue. Ensuring the cup’s vent is unobstructed and not overfilling the liner (leave some air space) helped keep paint feeding.
• Stirring: If you mix tint or stir additives, avoid a sharp-edged stir stick; it’s easy to nick the liner. I use a plastic paddle or stir gently before I put paint in the liner.

On my siphon-feed gun, I noticed the collar could pinch the liner if I rushed the setup. A deliberate, even tighten around the rim solved it. On the Wagner handheld, setup took seconds.

Durability and chemical resistance

With water-based latex and acrylics, the liners held up fine. I did a quick rinse in mineral spirits to test solvent resistance after a shellac-based primer session; the liner didn’t melt, but it felt a little more pliable after a few minutes. I wouldn’t store hot solvents, lacquer reducers, or xylene inside these for long. For oil-based use, my approach is simple: spray, then empty and discard the liner promptly rather than letting it sit.

I had one failure early on: a puncture at the rim caused by the liner catching on a sharp thread during tightening. That was on me. Since I started folding the cuff and checking thread engagement before tightening, punctures haven’t been an issue.

Cleanup and changeovers

This is where the liners shine. After spraying, I invert the gun over the paint can to drain, pull the liner, tie it off, and toss it. The cup stays almost spotless—usually a quick wipe does it. Switching colors is faster and cleaner, and I waste less paint because I’m not trying to scrub residue out of corners and threads.

There’s an environmental tradeoff: you’re generating plastic waste for each cup. If that doesn’t sit well, these might be better reserved for particularly messy coatings or when you know you’ll need multiple rapid color changes.

Efficiency and finish quality

I didn’t see any difference in finish quality attributable to the liners. Atomization is governed by the gun, tip, and material. What can affect efficiency is feed consistency. If the liner twists or blocks the vent, you’ll notice intermittent flow. Correctly fitted, the feed is consistent and efficiency improves overall because you spend less time tearing down and cleaning.

One note on capacity: the liner size comfortably handles the typical handheld cup fill (up to around a quart), but capacity is ultimately limited by your cup. Overfilling increases the chance of liner collapse and makes lid seating messier.

Tips to get the most out of them

• Pre-fit dry: Drop a liner, fold the cuff over the rim, and practice tightening the collar to see where it wants to pinch.
• Mind the vent: Confirm the cup’s breather path isn’t blocked. If needed, trim the liner at the rim so the vent remains open.
• Don’t overfill: Leave some headroom so the liner can flex and maintain a consistent feed.
• Secure the cuff: A small elastic band or binder clip keeps the liner from slipping and reduces twisting.
• Strain separately: Use a proper paint filter; these liners are not strainers.
• Gentle stirring: Mix before you pour, or use a rounded plastic stirrer inside the liner.
• Watch the pickup tube: Seat it into a corner of the liner bottom before tightening the lid to avoid early starvation.

Value and use cases

As a consumable, the value lands in time saved and mess avoided. For DIYers and remodelers who use handheld sprayers for trim, doors, fences, cabinets, or small exterior jobs, these liners are a worthwhile convenience. They’re also handy in a shop setting for keeping small fasteners together or staging pre-mixed touch-up paint for the day (short-term only).

Professionals who spray daily may prefer a closed-cup liner system for consistent feed at odd angles, or they’ll simply wash cups between colors. That said, keeping a sleeve of these liners in the truck as a backup for rapid changeovers or problem coatings is hardly a bad idea.

Shortcomings

• Compatibility isn’t universal. If your gun depends on a very specific vent geometry or has sharp collar threads, setup requires care—and some guns simply won’t play nicely.
• The liners can twist if you’re moving fast and working at extremes of angle. Securing the cuff helps, but it’s another step.
• Not solvent-proof for long soaks; they’re best with water-based materials or fast-turn oil-based work where you don’t store coatings in the cup.

Bottom line

The KOTESLLOE cup liners do exactly what I wanted most days: they save me cleanup time and keep cups from getting caked with residue. They’re simple, inexpensive, and—once you mind the vent and secure the cuff—reliable enough for routine projects. If you need a universal, closed-cup solution for professional work at awkward angles, look elsewhere. If you’re a DIYer or light pro who wants faster changeovers and cleaner end-of-day tear-downs on conventional cup-style sprayers, these are easy to recommend.

Recommendation: I recommend these liners for handheld and siphon-feed sprayer users who primarily spray water-based coatings and want to cut cleanup time dramatically. They’re not a replacement for a closed-cup system, and fit can be fussy on some guns, but with a little setup care they deliver the convenience they promise.