How to Spot a Cracked or Repaired Guitar Body (and When It's a Dealbreaker)

Here's the short version, because most buyers get it backwards: a crack in a guitar body is not automatically a dealbreaker, and a spotless finish isn't automatically clean. The skill that saves you money is telling a cosmetic crack from a structural one, knowing the handful of spots where solidbodies actually fail, and spotting a repair that was done well versus one done with a tube of superglue and some hope.

I've had hundreds of used electrics on the bench, and body cracks come up more than people expect — especially on older Gibsons and anything that's lived a hard gigging life. Here's what I look at, in the order I look at it.

Is it even a crack? Finish checking vs. the real thing

Before you panic over "cracks" in the photos, figure out whether you're looking at the finish or the wood. These are two completely different things.

Finish checking is a fine web of hairlines that appears across the surface of the lacquer, usually from the finish and the wood expanding and contracting at different rates — a guitar going from a cold car into a warm room is the classic cause. It lives in the finish. Nitrocellulose lacquer (what most Gibsons and vintage-style guitars wear) checks readily because it's thin and brittle. Thick modern poly finishes rarely check at all. Checking is cosmetic. On a lot of older instruments it's expected, and some players actually like the look. If you want the deeper story on that, I wrote a whole piece on whether finish checking is a problem on a used guitar.

A structural crack is different. It's usually a single line rather than a web, it often shows a sliver of bare, lighter wood at its edges, and — this is the tell — it can open, move, or flex when you put gentle pressure on either side of it. That's wood separating, not lacquer crazing.

Three quick tests

On the bench I use three things to sort one from the other:

• Raking light. Tilt the guitar so a light source skims across the surface. Checking shows up as a shallow, even grid. A real crack tends to stand out as a deeper single line, sometimes with a raised or stepped edge where the wood has shifted.
• The fingernail — carefully. People love the "if your nail catches, it's serious" rule, but be honest with yourself: heavy checking can catch a nail too. What you're really feeling for is a single defined edge, or a lip where one side sits proud of the other. That's structural.
• Gentle flex. With light thumb pressure on both sides, does the line open or close? Movement means the wood is separated. Do this gently — you're testing, not prying.

Where solidbodies actually crack

Cracks aren't random. They show up where the wood is thin, where hardware concentrates stress, and where a guitar takes a hit. Here are the zones I check first.

The neck joint — especially on an SG

This is the big one. On a set-neck guitar, the neck tenon glues into a pocket routed out of the body, and on a thin-bodied guitar like a Gibson SG there just isn't much wood left around that joint. SGs are genuinely known for developing cracks or outright failures at the neck heel, particularly if the guitar has taken a fall or been over-tightened somewhere in its life. Look closely where the neck meets the body, front and back, for any line following the edge of the pocket. A repaired-and-solid neck joint is fine; an active crack there is a real structural concern and should change what you pay — or whether you buy at all.

The output jack — a Les Paul classic

The side-mounted jack on a Les Paul (and its cousins) sits in a shallow dish routed into the rim of the body, and that thin shelf of wood cracks. Sometimes it's from years of cables getting yanked, sometimes from the jack nut working loose and the whole assembly spinning. Check around the jack cup for hairlines radiating out, and wiggle the jack — if the plate or the wood around it moves, that area has been stressed. It's a common and usually very fixable spot, but you want to know before you pay.

Control cavities, strap buttons, and drop marks

Two more places wood likes to split: the thin edges around the back control-cavity cover, and the end-pin/strap-button area, which takes the impact when a guitar tips off a stand. Any ding on a corner is worth a second look — a hard knock can crack finish and wood together. Headstock cracks are their own subject (Gibsons are famous for them, and I've explained why Gibson headstocks break separately), but the same physics applies anywhere the wood is thin and unsupported.

Is a repaired crack a dealbreaker?

Honest answer: usually not — if it was done right and it's in the right place. This is where I'll give you my real opinion instead of hedging.

A properly executed repair — the crack cleaned out, the right glue worked in, clamped up, and cleated if the location calls for it — can end up as strong as or stronger than the surrounding wood, because wood glue bonds tighter than the fibers around it. I've played plenty of guitars with old, solid repairs you'd never notice by feel or sound.

What worries me is a bad repair: superglue smeared over a crack that was never opened and cleaned, visible gaps, a line painted over to hide it, or a repair in a load-bearing spot — that SG neck joint again — that I can still feel moving. A cosmetic finish crack I barely factor in. A hidden structural repair someone tried to disguise gets a hard pass, both for the guitar and for what it says about the seller.

Location matters as much as quality. A repaired ding on a lower bout is a footnote; a repair through a neck pocket or around the jack is something you price around. A documented, well-done repair should knock the price down from an equivalent clean example — use it as leverage, not necessarily a reason to walk. Here's how I think about negotiating price on a used guitar.

My quick bench checklist

• Look under raking light across the whole body — top, back, and sides.
• Sort finish checking (a cosmetic web) from a single structural line.
• Hit the usual suspects: neck joint, output jack, cavity edges, strap buttons.
• Gently flex any suspicious line to see if it moves.
• If it's a repair, judge the quality and the location, then price accordingly.

None of this requires special tools — just good light, patience, and knowing where to aim your eyes. Every guitar in our in-stock collection has already been through this exact once-over, and anything worth noting gets called out in the listing. But whether you're buying from us or off a marketplace, these checks keep you from overpaying for a problem — or from walking away from a good guitar over a cosmetic crack that never mattered.

FAQ

Does a repaired guitar body crack affect tone?

On a solidbody electric, a properly repaired crack has no meaningful effect on tone — most of your sound comes from the pickups, strings, and setup. The real concerns with a crack are structural integrity and resale value, not tone.

Is finish checking the same as a crack?

No. Finish checking is fine crazing in the lacquer only, most common on nitrocellulose finishes, and it's cosmetic. A structural crack goes into the wood. Checking is expected on many older guitars; a wood crack needs a closer look.

How much should a repaired crack lower the price?

There's no fixed number — it depends on where the crack is, how well it was repaired, and whether it's documented. A cosmetic repair might barely move the price; a structural repair, like one at a neck joint, should mean a meaningful discount off a clean example.

Are SG body cracks a dealbreaker?

Not automatically. SGs are prone to neck-joint cracks because of their thin bodies, but a solid, professional repair can be perfectly reliable. An active, moving crack at the joint is the version to avoid — or to buy only at a price that reflects the repair it needs.