Choosing the best glue for plastic, wood, metal or a mix of materials comes down to matching the adhesive to the surfaces and the load. As a quick guide, PVA suits wood, epoxy handles metal and awkward gaps, super glue is best for small rigid parts, and polyurethane is your waterproof all-rounder.
Below we break down what to look for, then match common adhesives to real jobs with a side-by-side comparison, so you can buy once and stick it for good.
What's the best glue for plastic, wood and metal?
There's no single glue that's best at everything, which is exactly why the adhesive aisle is so big. For raw timber, a PVA wood glue gives the strongest, most even bond because it soaks right into the grain.
For metal and mixed or hard plastics, a two-part epoxy is the safest all-rounder, gripping smooth, non-porous surfaces and filling small gaps at the same time. For quick fixes on small, well-fitting rigid parts, a cyanoacrylate super glue is fast, strong and dries almost instantly.
For large flat sheets like laminate on a benchtop, contact adhesive is the go, coating both faces so they bond the instant they meet. For flexible seals around basins, glass and tiles, a silicone sealant flexes with the join instead of cracking, so the "best" glue is simply the one built for your exact materials.
Match the glue to the material
The single biggest factor is what you're sticking. Porous materials like timber, MDF and fabric love glues that soak in and grab, such as PVA and polyurethane. Smooth, non-porous surfaces like metal, glass and hard plastics need an adhesive that bonds on the surface, such as epoxy or super glue.
Some plastics are genuinely difficult, especially the waxy ones like polypropylene and polyethylene, so look for a product that actually names your plastic on the label. When you're joining two different materials, choose the glue rated for the harder-to-bond of the two.
Say you're fixing a metal bracket to a timber shelf: that pairs a non-porous metal with porous wood, so an epoxy that grips the metal is the smart choice. Get this call right and you're most of the way to a repair that lasts. The everyday glues, tapes and fixings for jobs like these live in our hardware accessories section.
Indoor or outdoor? Water and weather resistance
Where the repair lives decides how tough the glue needs to be. For anything outdoors, in a bathroom or near water, you need a waterproof adhesive such as polyurethane, marine-grade epoxy or an exterior-rated wood glue. A standard PVA will soften and let go if it gets wet, so it's strictly an indoor, dry-use option.
Heat and UV matter too, especially for items sitting in the sun, so choose a product clearly labelled for exterior or all-weather use. In kitchens and bathrooms, where steam and splashes are constant, treat every repair as a wet-area job and step up to a waterproof product. Sealants, fillers and outdoor-grade adhesives sit alongside the rest of our building consumables range.
Flexible or rigid — does the joint move?
Think about whether the join needs to flex or stay rock solid. Rigid adhesives like epoxy and super glue are brilliant on parts that don't move, but on something that bends, vibrates or expands they can crack and let go over time.
For joints that shift — say a plastic trim clipped to a metal frame that both heat up in the sun — a flexible adhesive or polyurethane sealant absorbs the movement without failing. Shoes are another classic case: they flex with every step, so a hard, brittle glue is the wrong tool for the job.
Cure time, clamping and gap-filling
Glues trade speed for strength and forgiveness. Super glue sets in seconds but won't bridge a gap, so the parts must fit closely together. Epoxy and polyurethane take longer to cure, often up to 24 hours for full strength, but they fill gaps and reach a much higher final bond.
Clamping counts for a lot, as most wood and structural glues want firm, even pressure while they set. If the surfaces don't meet perfectly, pick a gap-filling adhesive rather than forcing a thin glue to do a job it can't. Always check the label for the exact working and curing times, as these vary between products.
Watch the open time too — the window you have to position parts before the glue grabs. Fast glues give you seconds, so dry-fit and line everything up before you commit, while slower epoxies give you minutes to adjust. For anything structural, more curing time usually means a stronger, more forgiving bond.
Which adhesive suits which job?
Matching the glue to the task saves money and frustration. A weekend DIYer gluing furniture and trim mostly needs a good PVA wood glue plus a super glue for small fixes. Anyone tackling outdoor repairs, tiling or wet areas should reach for polyurethane, epoxy and the right sealant instead.
Renters after quick, no-damage fixes get a lot done with super glue and a strong double-sided tape, while tradies and keen hobbyists tend to keep epoxy and construction adhesive on hand for structural work. Some jobs aren't glue jobs at all: for chips, gaps and lifted edges in laminate or vinyl flooring, a dedicated filler such as Roberts quick-repair floor putty gives a cleaner, longer-lasting result than trying to bond a gap shut.
Adhesive comparison at a glance
Use the table below as a cheat sheet next time you're standing in the adhesives aisle, then match the pick to your surfaces and how much the joint will cop.
| Adhesive | Best for | Sticks | Water resistance | Set time |
|---|---|---|---|---|
| PVA wood glue | Timber joints, furniture, trim | Wood, MDF, paper, fabric | Low (indoor; exterior grades available) | Clamp 30-60 min; cures ~24 hr |
| Super glue (cyanoacrylate) | Small, tight, rigid repairs | Plastics, rubber, ceramic, metal, wood | Moderate | Seconds to a minute |
| Epoxy (two-part) | Strong bonds and gap-filling | Metal, glass, hard plastic, wood, stone | High | 5 min to a few hours by type |
| Polyurethane | Waterproof, structural, outdoor | Most materials, including damp timber | High | Cures ~24 hr |
| Contact adhesive | Laminates and large flat sheets | Laminate, veneer, rubber, leather, metal | Moderate to high | Bonds on contact after flash-off |
| Silicone sealant | Flexible seals and gap-filling | Glass, ceramic, metal, many plastics | High | Skins in minutes; cures over 24 hr |
Surface prep and usage tips
Most glue failures come down to a poor surface, not a poor glue. Clean off grease, dust, wax and old residue first — a wipe with methylated spirits is a cheap, effective way to degrease before bonding — then let it dry. Lightly sand or roughen smooth, shiny surfaces so the adhesive has something to key into.
A test fit before you glue is worth the two minutes, so check the parts actually meet before any adhesive comes out of the tube. Work in a well-ventilated spot, protect your skin and eyes, and lay an old tarp over the bench so drips and squeeze-out don't ruin the surface. Apply a thin, even coat rather than a thick blob, join the parts firmly, and clamp or hold them until set.
Buy the adhesive that matches your materials and conditions, keep a wood glue, a super glue and an epoxy on the shelf, and you'll be set for almost any repair around the house. Store them somewhere cool and dry and check the use-by date, because old glue that won't cure is the most common reason a good repair fails.
Frequently asked questions
What glue works on both plastic and metal?
A two-part epoxy is the most reliable all-rounder for bonding plastic to metal, because it grips dissimilar, non-porous surfaces and fills small gaps. For fast, light bonds, a cyanoacrylate super glue can work, ideally a gel or one made for plastics. Roughen and clean both surfaces first for the strongest hold.
What is the strongest glue for general use?
For strength across the widest range of materials, epoxy and polyurethane adhesives are hard to beat, as both cure rigid and resist water. The strongest glue is really the one matched to your materials, the load and the conditions. A super glue can be plenty strong for small, well-fitted joints.
Does super glue work on wood?
Yes, super glue bonds wood quickly and is handy for small repairs, trim and tight joints. For larger surfaces or load-bearing joints, a PVA wood glue gives a stronger, more even bond because it soaks into the timber. Clamp PVA joints and leave them to cure fully before stressing them.
How do I get glue to stick better?
Preparation does most of the work. Clean off grease, dust and old residue, ideally with methylated spirits, and let the surface dry. Lightly sand or roughen smooth, shiny surfaces so the adhesive can key in. Apply a thin, even coat, join the parts firmly, and clamp or hold them until the glue sets.
