Plastic cement, CA (super glue) and canopy glue each do one job well and a poor job of the other two - reach for the wrong one and you'll get a fogged canopy, a joint that doesn't hold, or a seam that's melted further than you meant. This guide sorts out which glue belongs on which part of the kit, so you're not guessing halfway through a build.
Why one glue can't do everything
Styrene plastic, metal, resin, photo-etch and clear parts all bond differently, and no single adhesive handles all of them well. Plastic cement works by chemically welding styrene to styrene, so it's no use on anything that isn't styrene. CA bonds almost any material to almost any other, but its fumes can cloud clear parts. Canopy glue is built specifically to avoid that fogging, at the cost of being a weaker structural bond than the other two. Matching the glue to the material is most of the job.
Plastic cement: your main glue
Plastic cement isn't glue in the everyday sense - it's a solvent that softens the surface of styrene plastic just enough for two parts to fuse into one piece as it evaporates, essentially welding them together rather than sticking them with an adhesive layer in between. That's why it only works styrene-to-styrene: apply it to resin or metal and there's nothing for the solvent to melt, so it won't bond at all.
This is the glue that will build the vast majority of a typical plastic kit - the fuselage, the hull, the chassis, most of the airframe or body panels. Our range includes Tamiya Extra Thin Cement and the standard-bodied Tamiya Cement Plastic, covering both the thin and thick application styles below.
Thin vs thick cement
Applying thin cement is almost the opposite process to using a traditional glue: hold the two parts together first, then touch the brush to the seam and let capillary action draw the cement into the joint by itself. Done well, this leaves a seam so clean it barely needs sanding, and it's the technique most experienced builders default to once they're comfortable with it.
Thick cement is applied the more familiar way - onto one part before joining - which buys more time to reposition things and forgives a slightly imperfect fit by filling small gaps as it sets. Starting with thick cement while you're still learning to line parts up is a reasonable choice, then moving to thin cement for cleaner seams once the fundamentals feel comfortable.
CA (super glue): powers and dangers
Reach for CA (cyanoacrylate) whenever styrene needs to bond to something that isn't styrene - metal axles, resin upgrade parts, photo-etch details - or when you need a near-instant hold rather than the minutes plastic cement takes to grab. Our range covers both thin CA, which wicks into tight seams almost like a thinner version of plastic cement, and medium CA, which gap-fills and holds heavier parts under more load.
The dangers are real and worth knowing before your first bottle: CA bonds skin almost instantly, it cures fast enough that there's little room to reposition a part once it touches, and its fumes can fog nearby clear parts even without direct contact. An accelerator (sometimes called a "kicker") cures a joint in seconds, but it locks in any misalignment just as quickly, so it rewards a careful test-fit beforehand rather than a hopeful dab and a wait.
Clear parts: the canopy glue rule
Canopies and windows are the one place to avoid both plastic cement and standard CA. Solvent cement can craze or cloud clear styrene outright, and even CA that isn't touching the part directly can fog it from vapour alone - either way, a clear part ruined at the final step is a rough way to finish a build.
A dedicated canopy glue like Zap Formula 560 Canopy Glue is PVA-based and dries clear without fogging, making it the safe default for windscreens, cockpit canopies and any glazed part. Tamiya's Multipurpose Cement (Clear) is a solvent-based alternative built to be gentler on clear parts, and works well when you want a slightly stronger structural hold than canopy glue gives.
What glue does to paint
Both plastic cement and CA can attack an already-painted surface, softening or clouding the finish where they touch it. The usual sequence avoids this: handle structural gluing first while parts are still bare plastic, then mask the glue joint before painting so overspray and glue never have to meet. If a repair is needed after painting, spot-apply as little glue as possible and keep it well clear of the surrounding finish.
Why glue goes bad in the bottle
CA and cement both have a shelf life once opened, and it's worth knowing why. CA cures by reacting with moisture in the air, so a bottle that's opened and closed repeatedly - or stored somewhere humid - gradually thickens and can eventually set solid even with the cap back on. Cement thickens differently, as its solvent slowly evaporates through a cap that isn't sealing perfectly or a nozzle that wasn't wiped clean before closing. Keeping bottles capped tightly, wiping the nozzle before closing, and storing them somewhere cool and dry are the easiest ways to get full life out of a bottle before either scenario catches you out.
Good airflow matters too - plastic cement and CA both release fumes as they cure, and CA fumes especially are what fogs nearby clear parts even from a distance. An open window or a well-ventilated room is enough for occasional hobby use.
Fixing mistakes
CA mishaps are usually the easier fix - Zap Z-7 Debonder loosens cured CA so a misplaced part can be worked free without excessive force. Cement mishaps are a different story: because it's a solvent weld rather than a glue bond, there often isn't a clean way back once two parts have fused, which is why a dry-fit before cementing matters more than it does with CA.
Two rescue situations worth knowing from our own customer questions: if a bottle of adhesive or cement arrives hardened or otherwise unusable, Message Us straight away and we'll put it right. The same applies if a bottle arrives still sealed but the glue has already set inside - that usually points to a manufacturing seal fault rather than anything you did - flag it with us and we'll put it right.
FAQs
Can I build a whole kit with super glue?
You can, but it isn't the better choice for most of a styrene kit. CA costs more per join than plastic cement for the same coverage, and it sits as a bonded layer rather than fusing the plastic the way cement does, so seams are more likely to show. Save CA for the joins plastic cement can't handle - dissimilar materials and instant-hold repairs - rather than using it as an all-purpose substitute. If you only build the occasional kit and don't want two adhesives on the shelf, CA is the more forgiving compromise of the two - just expect slightly more visible seams than a cement build would give.
Why did my canopy fog?
Almost always either CA vapour or plastic cement fumes reaching the clear part, even without direct contact. Switching to a dedicated canopy glue removes the risk entirely, since it's formulated to resist fogging or crazing clear plastic.
How do I unstick cemented parts?
Undoing a cemented joint is much harder than undoing a CA joint, since cement fuses the plastic rather than gluing two surfaces together. Some builders have success with careful, gentle heat or specific solvents to loosen a joint, but there's a risk of damaging the part in the process. Treat cement as close to permanent, and lean on a dry-fit before applying it rather than counting on a fix afterwards.
Ready to stock up? Browse the full Adhesives & Tapes range, or start with Essential Tools for Building Model Kits if you're still building out your basic kit. New to kits altogether? Best Model Kits for Beginners in NZ is the place to start.
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