The one rule that saves most repairs: box or board?
Before you touch anything, sort the damage into two piles, because the most useful rule in game repair is that a warped box and a warped board are fixed in opposite ways. A warped or saggy box responds to a little moisture on the inside plus heavy flat weight until it dries straight. A warped board must never get wet — water seeps under the printed paper and lifts it — so a board is flattened with weight and patience alone. Get those backwards and you turn a fixable game into a ruined one. This guide is about restoration; routine wiping-down of dirty components is a different job we cover in our board game cleaning guide.
Flattening a warped or saggy box
A box lid that bows or a bottom that sags wants to be made briefly malleable, then pressed flat while it dries. Dampen the inside — a wet sponge, a plant mister, or a little water swirled around and poured back out — damp enough that the cardboard softens, never soaked. Line it with wax paper so nothing sticks, then press the box under a large flat weight close to its own size, like a thick book or a bookend, and leave it until fully dry. One exception matters: if the gameboard is printed on the box bottom, never wet that side — flip the box and dampen the bare cardboard underneath. The safeguard against mold is simply damp not wet, dried completely. There's also a no-water version for a slowly sagged lid: empty the box and store it upside down so the sagged lid sits on the bottom, and over a few weeks it settles back flat — just keep the upward-facing side clear, or it will sag instead.
Flattening a warped board — weight only, never water
This is the rule collectors are most emphatic about: do not wet a warped board. Water wicks under the lithographed paper and separates it from the cardboard, and there's no undoing that. Instead, open the board flat and put it under something large, heavy, and evenly weighted for days — a stack of heavy games, or the classic move of sliding it between a mattress and box spring. Even badly bowed boards come back flat given enough time under steady pressure. A contested shortcut is steam-ironing the inside of a box lid (cotton setting, steam on, a cloth between iron and card, then press face-down under books) — reported to work well but genuinely risky, so practice on a thrift-store castoff first.
Rebuilding box corners and split aprons
The sides of a box are called the aprons, and where an apron meets the lid or bottom is the edge — this is where boxes fail most. Torn, split, or missing aprons are the most common serious box damage, and even a 'flat' box with every apron torn off can be rebuilt into a sturdy cover. Work aprons-up on a wax-paper-protected surface and follow a few principles.
- Use as little glue as possible — a thin line of acid-free or archival glue (which stays flexible) or a good white PVA along the inside edges. It goes on white and dries clear.
- Glue the inside edges first and let them dry, then do the corners one at a time, or two diagonally opposite corners at once.
- For a split corner, glue each apron end, clamp them with a paper clip (longer arm outside), press firmly, and add a little glue at the corner tip. Leave it a full 24 hours; the clip then snaps off cleanly.
- To replace a missing apron, stand a cut piece of cardboard perpendicular to the box, brace it with a book, and glue the inside edge. You can color-photocopy a matching apron and glue the copy over it — and where box art and board share the same illustration, a copy of one can patch the other.
- A corner vice or reverse-tweezers clamp holds tricky repairs, and serious collectors keep valueless junk boxes purely as repair material.
Split boards and delaminating cardboard
Boards separate along the crease with use, and layered tiles and chits peel apart at the edges. For a board splitting at the fold, apply linen hinging tape to the underside — a brand like Lineco is sold in framing and art shops. It comes self-adhesive (peel and burnish, plenty for an average board) and water-activated (stronger, for large heavy boards); on older uncoated boards choose the self-adhesive kind, since the moisture in water-activated adhesive can separate the paper. A cheaper stand-in is self-adhesive black vinyl across the fold. For a peeling tile, chit, or board corner, dab a little white PVA glue into the split with a cotton swab — just enough to wet both faces — press it shut, wipe any squeeze-out with a damp swab, and set a book on top for a few hours. A thin bead of the same glue on the interlocking edges of heavily-handled tiles keeps them from delaminating in the first place.
Fixing snapped and bent miniatures
Plastic figures break at thin points — sword arms, standards, ankles. For a clean snap, use thin or regular superglue, not the gel kind: gel won't wick into the joint, while thin glue runs into the seam and grabs. Cheap regular superglue is fine. For an appendage that keeps breaking, drill and pin it with a short length of wire for a joint that lasts. Bent figures are a different fix — many PVC minis have shape memory, so a few seconds in very hot water lets you straighten the bend, then a dunk in cold water sets it. A hairdryer works as a heat source but is riskier, since it can melt detail. And never microwave a miniature to soften it — it doesn't reshape the figure, it melts it into a puddle.
Removing old tape, stickers, and price tags
The safe solvent for adhesive is rubber cement thinner. Saturate a corner of the sticker or tape, fold the loosened part back over itself (non-sticky side against the box), and press down while sliding — never lift up — adding thinner as you go; if the paper facing starts to lift, restart from a different point. For heavy old tape, lighter fluid (naphtha) also works, but it's mildly toxic: ventilate the room, soak the tape, and lift from the edges, since dry tape tears the paper. The faint stain it leaves almost always evaporates, and sometimes clear tape already on a cover is safer left in place. Two things to remember: never use tape on games at all — it yellows, embrittles, and lifts paper when it fails, so never tape a box cover or a board. And rubber bands disintegrate and fuse to boxes over time, so band a game only for transit, near opposite edges, and lift the bands off rather than sliding them.
Mildew, mold, and insect damage
Mildew is the one problem that spreads, so learn to spot it: the first sign is a slight bluish soiling that looks like dirt but feels almost velvety and has a smell. The tell is that it does not wipe off dry and does not smear when lightly sponged — plain grime does both. It's a fungus that eats paper and jumps from game to game, so isolate anything infected until you're sure it's gone. Act fast: bag dry powdery cases, or dry damp ones on waste paper under a fan, weighted under cloth-wrapped books so they don't warp. Once dry, brush the loose mold off with a soft brush outdoors — not over the rest of your collection — then kill what remains with denatured alcohol or hydrogen peroxide on a swab, never poured on, and blot dry. For heavy infestations, a bathroom mildew remover is the last resort: gloves on, room well ventilated, test a small spot first, wipe with a damp sponge, air dry. Be realistic — mildew stains are usually permanent. Insect damage shows as chewed-looking edges and specks of missing artwork; clean and air the game out, but once the paper is eaten away it's essentially beyond repair.
Crayon, grease pencil, and ink marks
Surface marks come off with the gentlest method that works. Hard crayon can be softened with a little heat and lifted with a paper towel. Grease-pencil marks — common on thrift-store finds — respond to a kneaded eraser worked soft and used with light pressure, rotating to a clean face; press too hard and you take the printed graphic with it. Ink and deeply embedded grime are usually permanent, and here's the discipline that separates a repair from a botch: don't over-restore. Coloring in a worn spot fades differently from the original printing and ages badly, so if you must experiment, touch up a photo of the game, not the game itself. If a card gets shuffled hard after a repair, sleeve it in a premium sleeve to protect the fix, and add a penny sleeve underneath to fully seal a card you really want to protect.
Most repairs are really storage problems
Almost every fix here traces back to how the game was kept. Warped boards, sagged boxes, mildew, brittle paper, and crushed corners are all storage damage. Keep games out of damp and direct sun, away from big temperature swings, and never in a stack so tall the bottom box is crushed — store boxes flat or shelved upright on something deep enough to hold them, like a sturdy cube shelf, so nothing bows under its own weight. That one habit prevents more damage than any repair reverses. And one ethic worth keeping if you ever sell or trade a game: disclose any repairs in the description. A good fix is nothing to hide, but a buyer deserves to know.