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Coating/Wax Injector

Coating and wax injectors force rust inhibitor, cavity wax, or underseal into vehicle body panels, sills, and box sections where brush or spray can't reach. These air-operated guns atomise thick product and push it through narrow probes into closed cavities. Choose between canister-fed models for small batches and suction-feed guns for continuous work from bulk containers.

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The main choice is feed method. Canister guns hold a litre or two in an onboard reservoir—quick to refill, less mess, good for panel work or small fleet jobs. Suction-feed guns draw straight from a drum or tin, which matters when you're doing dozens of sills or an entire chassis. Both need clean, dry air; moisture in the line clogs the nozzle and thins the wax.

Probe length and diameter matter more than the gun body. Short rigid probes work for door skins and shallow cavities. Long flexible extensions—sometimes over a metre—are necessary for rear quarter panels, A-pillars, or anywhere the access hole is remote from the cavity end. Disposable probe heads and tubes let you swap between wax and underseal without cross-contamination or solvent flush.

Wax viscosity changes with temperature. Warm the product if it won't atomise; most cavity waxes flow better at 20–30°C. Too cold and the gun spits lumps; too hot and it runs out before it cures. Check the product data sheet for the working range, then match your probe diameter—thicker wax needs a wider bore. Sealey's kits come with multiple nozzle sizes to cover different materials.