How to Apply Water Slide Decals on HG Zaku Big Gun

Quick Answer

To apply water slide decals on your HG Zaku Big Gun without silvering or tearing, work on a clean, glossy surface, soak each decal briefly in warm water, and use a soft brush and setting solution to position and seal it.

Step-by-Step Application Process

1. Prepare the surface: Clean the model with mild soapy water or a degreaser to remove mold release and fingerprints. Apply a gloss coat (spray or brush) and let it cure fully for at least 24 hours. A glossy surface prevents silvering and gives the decal something to grip. Check that the surface is completely smooth and dust-free before starting.
2. Cut out the decal: Use a sharp hobby knife or scissors to cut close to the printed design, leaving a thin clear border. Cutting too close can weaken the decal; cutting too far leaves excess film that may show. Cut one decal at a time to avoid confusion and keep the backing paper dry.
3. Soak in warm water: Dip the decal in warm (not hot) water for 10–20 seconds until the film starts to slide from the backing paper. Remove and let it sit on a flat surface for a few seconds. If it doesn't slide easily, soak a little longer – but don't over-soak or the decal may curl and stick to itself. Test the slide on a scrap decal first to gauge the right soak time.
4. Position the decal: Slide the decal onto the model using a damp brush or cotton swab. Use the tip of a hobby knife or a toothpick to nudge it into place. Work quickly but gently; once the decal touches the surface, it starts to bond. If it's misaligned, you can lift it with a wet brush within the first few seconds. Position the decal before it fully releases from the backing paper to avoid tearing.
5. Remove excess water and air bubbles: Gently roll a cotton swab or soft brush from the center outward to push out water and air bubbles. Avoid pressing too hard, which can stretch or tear the decal. Use a tissue to blot excess water, but don't wipe – that can shift the decal. If bubbles remain, prick them with a pin and apply more setting solution.
6. Apply setting solution (optional but recommended): Brush a small amount of decal setting solution over the decal to soften it and help it conform to curved surfaces like the Zaku's shoulder armor. Let it dry completely. For stubborn areas, apply a decal softener, but use it sparingly – too much can weaken the decal. Wait until the decal is fully dry before touching it or applying the next decal.
7. Seal with topcoat: After all decals are dry (at least 24 hours), spray a clear topcoat to protect the decals from scratches and moisture. Use gloss for a shiny look, satin for a semi-gloss, or matte for a flat finish. This also hides the decal edges. Do not skip the topcoat – it's the difference between a decal that lasts and one that peels off later.

What You'll Need

• HG Zaku Big Gun Water Slide Decals: The HG Zaku Big Gun Water Slide Decals are designed for HG Zaku models and include markings suited for the Zaku Big Gun theme. These decals are tailored to the kit's panels and curves, so they fit without major trimming and give your model a more finished, personalized look.