KOTESLLOE 30 Pcs Paint Sprayer Bags, 7.8'' X 11.8'' Sprayer Cup Liners, Transparent Spray Gun Cup Canister Liners for Wagner Paint Sprayer Parts

Why I started using liners

I reach for liners anytime I’m spraying projects back-to-back, especially when I know I’ll be switching colors or coatings. The KOTESLLOE paint sprayer cup liners are a simple idea—a clear, disposable bag that sits inside your sprayer’s cup—but they can make a meaningful difference to cleanup time and mess. After several projects, including a deck refresh and some interior trim, I’ve formed a clear picture of where these liners shine and where they frustrate.

What they are (and aren’t)

These are basic, transparent bags sized at 7.8 x 11.8 inches, sold in a 30-pack. They’re meant to sit inside a standard spray gun cup to keep the canister clean so you can skip most of the scrubbing afterward. They don’t turn your sprayer into a sealed, collapsible-bag system like PPS-style setups; you still rely on your gun’s pickup tube and cup lid, and you can’t spray upside down. Think of them as a practical cleanliness aid, not a system upgrade.

Material-wise, the plastic is thicker than a common household bag, with a reinforced base that handles the weight of a full quart of water-based paint without feeling fragile. The transparency is useful—you can see how much material you have left and whether you’re pulling air.

Setup and fit

My main use was with a 1-quart siphon-feed HVLP cup and a consumer-grade turbine sprayer. In the larger cup, the fit was straightforward:

• Drop the liner into the cup, tuck the bottom into the base.
• Feed the pickup tube down into the liner.
• “Burp” excess air from the liner.
• Fold the liner’s top edge over the rim so it’s captured when you tighten the lid.

On a smaller cup, there’s more excess bag material. That’s where the liners can misbehave—excess plastic can bunch, twist, or interfere with the pickup tube. A quick fix was to roll the liner’s lip tightly over the rim and secure it with a rubber band before closing the lid. That small step prevented the liner from twisting mid-spray in most cases.

These are generic liners, so compatibility varies. They fit cups with a wide mouth and a standard pickup tube best. Narrow, deeply threaded lids or proprietary cup geometries can pinch the plastic, and I had one puncture at the rim when I over-tightened a lid with sharp threads. If your gun relies on a very tight lid seal with little tolerance, test fit with water before committing to paint.

On the job

The practical benefit is obvious the first time you swap colors or wrap for lunch. For water-based paints, I could lift the liner out with a hand under the reinforced bottom, decant the leftover paint back into a can, and be ready for a rinse and reload in a fraction of the time. On a deck job, I switched from a solid stain to a railing trim color in minutes instead of soaking and scrubbing the cup.

Flow-wise, when the liner is seated correctly and the pickup tube is centered, there’s no noticeable impact on atomization or consistency. Problems crop up when the liner twists around the pickup tube or balloons; then the gun starves and sputters. That’s user-manageable:

• Burp the air from the liner before tightening the lid.
• Keep the pickup tube straight and fully submerged.
• Don’t overfill; leave headroom so the liner doesn’t press hard into the lid.

With those habits, I sprayed full quart loads without interruption.

Durability and materials

For water-based acrylics, latex, and waterborne enamels, the liners held up well. I intentionally abused a couple—dragged the rim across the cup threads and cranked the lid down—to see where failure happens. The most common weak points are:

• The lip: sharp threads can nick the plastic during tightening.
• The bottom seam: overfilling and then pressing the liner into the cup can stress the seam if the liner folds sharply at the base.

Used normally, I didn’t experience routine breaks. I did have a single seam failure when I overfilled and then tried to reposition the liner with the cup half full. Since then, I keep fills to three-quarters and press the base flat before adding paint.

For solvents, I tested with mineral spirits and a light enamel reducer in small quantities. The plastic didn’t immediately soften or cloud, but I wouldn’t trust these liners for hot solvents like lacquer thinner or acetone. If you spray solvent-based coatings regularly, test compatibility with a small pour first and avoid prolonged soaking.

Cleanup and waste

Cleanup is where these earn their keep. For water-based work, my post-spray routine dropped from a 10–15 minute wash-down to about 3–5 minutes: empty the liner, wipe the pickup tube and lid, quick rinse, and done. If you’re doing multiple colors in a day, the time savings compound.

There’s a trade-off, of course—single-use plastic. If you’re environmentally cautious, you’ll have to weigh solvent and water use against disposable liners. I minimize waste by decanting leftover material and then using the liner to bag the used filter and any masking scraps before disposal. It’s not a solution to the waste question, but it keeps the cleanup zone tidy and reduces solvent use.

Compatibility caveats

• Best fit: 1-quart siphon-feed cups and wide-mouth turbine sprayers.
• Mixed results: small gravity cups where the bag has nowhere to fold neatly.
• Not intended: proprietary cup/liner systems or any setup requiring a sealed, vented liner.

If your sprayer has a very tight lid that depends on a flawless plastic-to-metal seal, you may find pinching or leaks. One way to check is to fill a bag with water, seat it in the cup, tighten just to contact, and give the gun a quick trigger pull (no air) to see if any water escapes at the rim.

Practical tips

• Strain first, then line: Strain your paint before filling the bag to avoid dragging a strainer through the liner and risking a tear.
• Secure the lip: Roll the liner over the rim and use a rubber band before tightening the lid.
• Seat the base: Press the bottom flat and purge air to avoid ballooning.
• Mind the pickup tube: Keep it centered and fully submerged; trim bag excess if it interferes.
• Don’t overfill: Leave headroom for the liner to sit comfortably under the lid.
• Avoid sharp edges: If your cup’s threads are burred, deburr them lightly to prevent nicks.

Value

A 30-pack makes sense for anyone running a sprayer regularly for DIY projects, rental turnover, cabinetry touch-ups, or tradespeople who value quick turnarounds. The per-liner cost is low, and the time saved on cleanup pays back quickly if you’re spraying more than occasionally. If you spray once a year, you’ll appreciate the convenience, but the value proposition isn’t as strong.

What I’d change

• Offer two sizes: one for 1-quart cups and a shorter option for small gravity cups to reduce excess material and twisting.
• Thicker lip reinforcement: a heavier band at the top edge would resist thread nicks and improve sealing consistency.
• Solvent rating: a clear compatibility chart would help pros decide where these fit in a solvent-heavy workflow.

Who they’re for

• Homeowners and pros who spray water-based coatings frequently and want faster cleanup.
• Anyone switching colors mid-project.
• Users of wide-mouth, 1-quart siphon cups or turbine sprayers.

Less ideal for users with compact gravity cups or those who routinely spray solvent-based coatings with aggressive reducers.

Recommendation

I recommend these liners for water-based spraying with standard, wide-mouth cups. They keep the canister clean, speed up color changes, and meaningfully cut cleanup time when used correctly. They’re not a substitute for a sealed bag-and-collar system, and they demand a little attention during setup to prevent twisting or rim pinches. If your sprayer’s cup is compatible and you’re primarily spraying acrylics or latex, they’re a practical, low-cost addition to your kit that streamlines your workflow without adding complexity.