Preserving Model Kit Decals and Instructions

Why the Paper and Film Matter Most

A built model is only half the story. The box, the instructions and the decal sheet carry the history of the kit — the markings that tell you which squadron, which racing team, which year. Yet these are the very parts most likely to be ruined. Decal film is thin, brittle and light-sensitive, and instruction sheets are printed on cheap paper that yellows, cockles and tears with alarming ease. Once a decal has disintegrated in water or an instruction sheet has been folded one time too many, there is no bringing it back. A little forethought now saves a great deal of heartache later.

Storing Decal Sheets Properly

The golden rule is simple: keep decals flat, dark, dry and sealed. Decal film reacts badly to three things — ultraviolet light, moisture and pressure. Light fades the inks and makes the carrier film brittle; damp encourages mould and can activate the water-slide adhesive; and anything stacked on top will eventually crease or crack the sheet.

• Slip each decal sheet into a clear, acid-free polythene or polyester sleeve, the sort sold for stamp and postcard storage. Avoid cheap PVC wallets, which off-gas over time and can fuse to the film.
• Store the sleeves flat inside a rigid box, portfolio or plan chest drawer. Never roll a decal sheet, and never store it in a tube.
• Add a small silica gel sachet to the storage box and replace it every few months. In a British climate, humidity is your quietest enemy.
• Keep the box out of direct sunlight and away from radiators, lofts and sheds where temperatures swing. A cool, stable cupboard indoors is ideal.
• If you have several sheets, interleave them with acid-free tissue so they cannot rub together.

For sheets you intend to use, cut only the decal you need with a sharp blade and return the rest to its sleeve immediately. Never handle the sheet with damp or greasy fingers — natural oils lift the film edge.

Scan Instructions Before You Touch Them

Instruction sheets are working documents, and working documents get damaged. The solution is to scan them once, carefully, and then work from the copy. This protects the original and gives you a file you can reprint, enlarge or annotate without guilt.

Use a flatbed scanner at 300 dpi minimum, and 600 dpi if the sheet contains fine detail such as rigging diagrams or colour call-outs. Save as a lossless format — TIFF or a high-quality PDF — rather than a heavily compressed JPEG, which smears fine line work. Scan in colour even for black-and-white sheets, because ageing paper has a tint you may want to correct later.

• Clean the glass first. Dust shows up as white specks across every page.
• Do not press down hard on a fragile sheet; use the scanner lid gently and let the machine do the work.
• Scan both sides, even if one side looks blank. Hand-written notes, previous owners' amendments and stamp marks are part of the kit's story.
• Name your files logically — kit subject, scale and page number — and back them up in at least two places.
• Print a working copy on plain paper, or view it on a tablet on the bench. Either is better than risking the original.

Handling the Originals with Care

When you do need to consult the original — to check a colour match under proper light, or to compare a faded decal against a fresh aftermarket sheet — handle it as you would any paper antique. Support the whole sheet on a stiff card rather than holding it by one corner. Keep drinks, thinners and cement well away from the bench. If a page has detached, resist the urge to tape it; pressure-sensitive tape stains permanently. Store loose pages between acid-free card inside a rigid folder instead.

Decals that have already yellowed can sometimes be rescued by taping them to a sunny window for a few weeks, film side up, though this is a slow gamble and never a certainty. Test on a spare decal first if you have one.

Labelling and Long-Term Storage

A collection is only useful if you can find things. Label each sleeve and folder with the kit manufacturer's subject, scale and the year of issue, using a pencil on the outside of the sleeve rather than a sticky label on the sheet itself. Keep decals and instructions for the same kit together in one archival envelope, so the parts do not drift apart over the years.

Check your stored sheets once a year. Look for curling edges, bloom on the film, or the first hints of foxing on paper. Deal with problems early — re-sleeve anything that has become damp, and move the whole collection to a drier spot if you find mould.

Enjoying the Hobby Without the Anxiety

There is a real pleasure in opening a drawer and finding decals still supple and instructions still crisp after thirty years. That is the reward for a modest amount of routine care: sealed sleeves, flat storage, sensible humidity, and a good scan made while the original was still in fine fettle. Do the work once, and you can build, admire and pass on the whole kit — markings, paperwork and all — with confidence.