Different jobs call for different adhesives, and results can vary by plastic type and joint style.

• Plastic cement: Great for polystyrene and ABS kits. It softens the plastic to create a weld, which can help with strong, clean seams. Extra-thin formulas wick into tight joints; thicker versions can fill minor gaps.
• Cyanoacrylate (CA) super glue: Useful for fast bonds and mixed materials (resin, metal). Thin/medium works for tight fits; gel can help with small gaps and vertical joints.
• Two‑part epoxy: Offers working time for alignment and solid gap filling on heavy or stressed parts.
• Clear parts cement/PVA: Often preferred for windows and lenses to help reduce fogging.

Test on scrap when possible, work in a ventilated area, and allow full cure before sanding or painting.

A few careful steps can help you get tidy, strong bonds.

1. Prep: Wash parts to remove mold release, then lightly sand mating surfaces for better grip. Dry fit first.
2. Choose adhesive: Use plastic cement on styrene/ABS joints, CA for mixed materials or tiny spots, and epoxy for heavy or high‑stress joins.
3. Apply precisely: Use a fine brush, needle applicator, or micro‑tips. Extra‑thin cement can wick into seams by capillary action after parts are held together.
4. Clamp and hold: Maintain gentle pressure with clips or tape until the bond sets. Avoid squeezing glue onto visible areas.
5. Clean up: Carefully scrape or sand cured squeeze‑out. Avoid harsh solvents on clear parts.

Work with good ventilation, follow label directions, and give the joint time to fully cure before handling or finishing.

Thick, flexible craft adhesives can work in certain situations, but they’re not typically the first choice for most scale kit joints.

• Where it can help: Attaching dissimilar materials or when a slightly flexible bond is useful. It’s also less likely to fog clear parts than some fast‑setting glues.
• Tradeoffs: These formulas often cure thicker, can add weight, and may not “weld” styrene like dedicated plastic cement. They also tend to have longer cure times and strong fumes.

For most styrene/ABS assemblies, plastic cement or CA is usually favored. If you try a craft adhesive, test on scrap, use in a ventilated area, and allow full cure before sanding or painting.

Toys use different plastics, so the best adhesive depends on the material and the break.

• Hard plastics (e.g., many ABS parts): Plastic cement can work if the toy is a cement‑friendly plastic. For quick repairs, a gel CA can provide a small, precise bond.
• Load‑bearing or gap repairs: Two‑part epoxy offers strength and gap filling with a longer working time.
• Hard‑to‑bond plastics: Some plastics resist common glues. A plastic‑specific activator/primer system may improve adhesion.

Clean and dry surfaces thoroughly, clamp lightly while setting, and let the adhesive fully cure. For items used by children, confirm the repair is secure, avoid small loose parts, and follow all product and adhesive safety guidelines.

Set and cure times vary by formula, joint fit, temperature, and humidity.

• Plastic cement: Often tacks in a few seconds to several minutes. Handling strength may develop in 10–30 minutes, with full cure commonly 12–24 hours.
• Cyanoacrylate (CA) super glue: Can set in seconds to a minute depending on thickness; full strength may continue to build over several hours. An accelerator can speed surface cure.
• Two‑part epoxy: Typical working times range from 5–30 minutes, with full cure around 8–24 hours.

These ranges are general. For best results, follow the label, avoid stressing joints too soon, and wait for full cure before sanding, priming, or painting.