What is the strongest all-around glue for DIY repairs?

There's no single strongest glue - it depends on the job. For gap-filling metal repairs, steel-reinforced epoxy putty like J-B Weld SteelStik hits 4000 PSI. For fast bonds on tight-fitting parts, a rubber-toughened super glue is strongest. Match the adhesive to the material and gap rather than chasing one number.

Can I use super glue on wet or oily surfaces?

No. Cyanoacrylate needs clean, dry surfaces to bond well - oil, dust, and standing water all weaken it. For wet repairs, use a water-cure epoxy putty like J-B Weld WaterWeld, which is designed to set even underwater.

Does super glue work as a threadlocker?

Not reliably. Super glue is brittle and can crack under vibration, and it isn't designed for the shear and torque on a fastener. Use a purpose-made anaerobic threadlocker (Loctite Blue 242 or Red 271) so the bolt stays put yet remains removable when needed.

How to Choose the Right Glue: A Material-by-Material Guide

By The DIYPicks Team · Updated July 2026

The single most common gluing mistake is grabbing whatever tube is in the drawer. The right adhesive depends on the material, the gap, and whether the joint moves or gets wet. This guide matches the job to the glue so your repair actually holds.

Start with two questions: what material, and is there a gap?

Every adhesive choice comes down to two things. First, what are you bonding - plastic, metal, foam, fabric, or a threaded fastener? Second, do the surfaces meet cleanly, or is there a gap to fill? Clean, tight-fitting parts want a thin, fast adhesive like super glue. A void, a missing chunk, or a hole wants a gap-filling putty or epoxy.

Also ask whether the joint flexes, vibrates, or gets wet. A rigid super glue bond can crack on a part that bends, and an ordinary epoxy fails on a wet surface. Matching those conditions to the adhesive's strengths is what separates a lasting repair from one you redo next month.

Plastic: know your plastic first

Most hard plastics - ABS, acrylic, polycarbonate, PVC, polystyrene - bond fine with a quality super glue gel like Gorilla Super Glue Gel or Loctite Ultra Gel Control. Rough the surface lightly, keep the fit tight, and hold for 30 seconds.

The exceptions are polyethylene (PE) and polypropylene (PP), the slick plastics used in totes, bumpers, and appliance housings. Standard CA glue slides right off them. For those you need a two-part system with a surface activator, such as the Loctite Plastics Bonding System, which primes the surface so the glue can grab.

Metal: instant fix vs structural rebuild

For a small, clean metal-to-metal bond where the parts fit tightly, super glue or a two-part epoxy works. But most metal repairs involve a gap, a crack, corrosion, or missing material - and that's where hand-mixable epoxy putty wins. J-B Weld SteelStik packs into holes and rebuilds shape, curing to 4000 PSI and taking a drill or tap.

If the metal repair is wet or involves plumbing - a leaking pipe or tank - switch to J-B Weld WaterWeld, which cures even underwater and is NSF-safe for potable water. For threaded metal fasteners, neither glue applies; use a threadlocker instead.

Foam and fabric: think spray, not tube

Large soft materials - upholstery foam, batting, headliners, insulation, felt - can't be bonded with a tube of glue without lumps and cold spots. A multipurpose spray adhesive like 3M Super 77 or Loctite High Performance 200 lays an even tacky film across the whole surface so the layers bond flat.

Spray both surfaces, let the adhesive flash to a high tack, then press. These are laminating adhesives, not structural ones, so don't rely on them for load-bearing joints. Mask around the work area, because overspray drifts and stays sticky.

Threaded bolts: lock, don't glue

Bolts that vibrate loose need a threadlocker, not adhesive. These anaerobic liquids cure in the absence of air between mating metal threads. Use Loctite Blue 242 (medium strength) on anything you'll service again - it stops loosening but breaks free with hand tools.

Use Loctite Red 271 (high strength) only on structural or safety-critical bolts that must never move, remembering you'll need heat to remove it later. Both require bare metal-to-metal contact and won't cure on plastic threads.

A quick material-to-glue matrix

Hard plastic (ABS/PVC/acrylic): super glue gel. Slick plastic (PE/PP): plastics bonding system with activator. Clean metal, tight fit: super glue or epoxy. Metal with a gap or hole: steel epoxy putty. Wet metal or plumbing: water-activated epoxy putty. Foam/fabric/large sheets: spray adhesive. Threaded fasteners: blue threadlocker (serviceable) or red (permanent).

When two options both seem to fit, default to the more removable one. It's easy to re-glue a bond that didn't hold, but very hard to undo a permanent one on the wrong part.

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Frequently Asked Questions

What is the strongest all-around glue for DIY repairs?: There's no single strongest glue - it depends on the job. For gap-filling metal repairs, steel-reinforced epoxy putty like J-B Weld SteelStik hits 4000 PSI. For fast bonds on tight-fitting parts, a rubber-toughened super glue is strongest. Match the adhesive to the material and gap rather than chasing one number.
Can I use super glue on wet or oily surfaces?: No. Cyanoacrylate needs clean, dry surfaces to bond well - oil, dust, and standing water all weaken it. For wet repairs, use a water-cure epoxy putty like J-B Weld WaterWeld, which is designed to set even underwater.
Does super glue work as a threadlocker?: Not reliably. Super glue is brittle and can crack under vibration, and it isn't designed for the shear and torque on a fastener. Use a purpose-made anaerobic threadlocker (Loctite Blue 242 or Red 271) so the bolt stays put yet remains removable when needed.