How to Mount Cartoon Cels in a Glass Case

Cartoon cels are one-of-a-kind pieces of animation history. Each hand-painted acetate sheet was once part of a frame in your favorite cartoon. Because they're fragile, lightweight, and sensitive to heat and adhesives, mounting them the wrong way can cause warping, paint cracking, or sticking. Knowing how to mount cartoon cels in a glass case the right way protects your investment and keeps the artwork looking sharp for decades.

What does it mean to mount a cartoon cel in a glass case?

Mounting a cartoon cel means securing the painted acetate sheet inside a sealed glass or acrylic display case so it stays flat, visible, and protected from dust, UV light, and physical damage. Unlike framing a print or poster, cels require special handling because the paint sits on the surface of the acetate rather than being absorbed into it. Any direct adhesive or pressure can pull paint right off the cel.

The display case itself acts as a barrier between the artwork and the outside environment. You're essentially creating a controlled, enclosed space where the cel can hang or rest without touching the glass on either side.

Why can't you just tape a cel to a frame and call it done?

Tape, glue, and spray adhesive are the fastest ways to ruin a cartoon cel. Standard masking tape or scotch tape will yellow, harden, and bond to the acetate over time. When someone tries to remove it later, the paint often comes with it.

Cels also shift and buckle when they aren't held properly. Gravity and humidity changes cause the thin acetate to warp if it's only fixed at one or two points. A glass case with proper mounting keeps the cel flat without putting stress on any single spot.

If you've collected cel art or purchased authenticated cartoon artwork, you already know these pieces aren't cheap. Skipping proper mounting to save a few dollars isn't worth the risk.

What materials do you need for mounting cartoon cels?

You don't need expensive equipment, but you do need the right supplies. Here's what works:

Glass or acrylic display case UV-filtering glass is preferred. Acrylic can build static charge, which may attract the cel to the surface.
Acid-free mat board Used as a backing and spacer. Regular cardboard releases acids that yellow and damage cels over time.
Japanese paper hinges or Mylar strips These hold the cel at the top edge only, allowing it to hang freely and move slightly with temperature changes.
Wheat starch paste or archival photo corners Gentle, reversible adhesives that won't bond permanently to the cel.
Lint-free cotton gloves Oils from bare hands transfer to the acetate surface and can cause paint degradation.
Spacers or mat layers These keep the glass from pressing directly against the painted side of the cel.

How do you prepare the cel before mounting?

Start by inspecting the cel under good lighting. Look for flaking paint, warping, or sticky residue from old tape. If there's existing tape from a previous framing job, don't pull it off yourself. Take it to a professional conservator. Pulling old adhesive can strip paint in seconds.

Next, gently dust the surface with a soft, clean brush. Never use water, cleaning spray, or a cloth on the painted side. Even a damp microfiber cloth can lift acrylic paint from older cels.

If the cel is rolled or curled, don't force it flat. Instead, place it between two sheets of acid-free tissue and let it relax under a flat, weighted surface for a few days. Keep it at room temperature and away from direct sunlight during this step.

Once the cel lies flat, handle it only with clean cotton gloves from this point on.

How do you actually mount the cel inside the case?

This is the part most people get wrong. Here's a method that conservators and experienced collectors use:

Cut a backing board from acid-free mat board to fit the inside of your display case. This board serves as the surface the cel will rest against.
Position the cel on the backing board where you want it displayed. Mark the top edge lightly with pencil on the board.
Attach the cel at the top only using Japanese paper hinges and wheat starch paste. Apply a small dab of paste to the hinge, not to the cel. Press the hinge over the top edge of the cel onto the backing board. This lets the rest of the cel hang freely and expand or contract with humidity changes.
Add spacers thin strips of mat board or foam board around the edges of the backing board. These create a gap between the cel and the glass so the painted surface never touches the glass directly. This is critical. If paint touches glass, changes in humidity can cause the paint to stick to the glass permanently.
Place the mounted backing board into the glass case and seal it. Make sure the case has a reasonably tight seal to limit dust entry, but don't make it airtight a small amount of air circulation prevents moisture buildup.

For those looking for the right case dimensions, you can explore options for custom shadow box dimensions that match your cel size without leaving too much empty space inside.

What kind of glass should you use?

Regular glass blocks almost no UV light. Over months and years, UV exposure fades the painted colors on cartoon cels, especially reds and yellows. Museum-grade UV-filtering glass blocks up to 99% of UV rays and is the standard for anyone serious about preserving animation art.

Anti-reflective coating is a nice bonus. It reduces glare so you can see the cel clearly from different angles without reflections washing out the image.

Acrylic (Plexiglas) is lighter than glass but carries a static charge that can pull the cel toward the surface. If you use acrylic, make sure your spacers keep enough distance between the cel and the front panel. Some collectors add an anti-static treatment to the inside surface of the acrylic, though this is an extra step.

What are the most common mistakes people make?

Here are the errors that cause the most damage to cartoon cels in display cases:

Letting the cel touch the glass. Paint bonds to glass over time, especially in warm, humid rooms. Always use spacers.
Using tape or hot glue. These are permanent, damaging, and will yellow. Use only archival materials.
Skipping UV protection. A cel displayed behind regular glass in a sunny room can fade noticeably within a year.
Sealing the case too tightly. Trapped moisture leads to mold and foxing on the backing materials. Leave the case slightly breathable.
Hanging the case in direct sunlight or near heat sources. Even with UV glass, heat warps acetate. Keep cels on interior walls away from windows and radiators.
Mounting with too many attachment points. Fixing the cel along all four edges restricts natural expansion and causes buckling. Top-hinge mounting only is the standard practice.

How do you label or annotate the display?

Many collectors include a small printed card inside the case identifying the cartoon, episode, studio, and year of the cel. If you create your own labels, use acid-free card stock and a clean typeface. For a handwritten or artistic feel that pairs well with animation art, a font like Permanent Marker works nicely on printed labels.

Place the label on the backing board below or beside the cel never attached to the cel itself.

Can you mount multiple cels in one case?

Yes, but each cel needs its own backing and its own set of spacers. Stacking cels on top of each other or letting two cels share the same surface without separation causes the paint on the bottom cel to stick to the back of the top one. Treat every cel as its own independent piece within the case.

If you're displaying a sequence of cels from the same scene, arrange them side by side or in a row on one wide backing board, each with individual matting and hinge points. You can look into custom shadow box sizing if you need a wider format for multi-cel displays.

What should you do after the cel is mounted?

Check the case every few months. Look for any signs of warping, paint flaking, or moisture inside the glass. If you notice condensation, the seal may be too tight or the room humidity is too high. A small silica gel packet (archival-grade) tucked behind the backing board can help absorb excess moisture just make sure it's not touching the cel.

Keep the display out of direct sunlight even with UV glass. Rotate displays if you have a collection, giving some pieces a rest in storage between display periods. Store removed cels flat between acid-free tissue sheets in a cool, dry, dark location.

Quick checklist before you seal the case

Cel inspected for existing damage or old adhesive
Backed with acid-free mat board
Attached at the top edge only with archival hinges
Spacers in place so the cel never touches the glass
UV-filtering glass installed on the front panel
Case sealed but not airtight
Display location chosen away from sunlight and heat
Label placed on the backing board, not on the cel

Take your time with each step. Rushing through the mounting process is the number one reason cels end up damaged inside what was supposed to be a protective case. If the cel is especially valuable or fragile, consider hiring a professional framer who has experience with animation cels specifically not just general artwork framing.