How to Apply Gunpla Waterslide Decals Without Silvering

Knowing how to apply Gunpla waterslide decals comes down to surface preparation, controlled placement and enough drying time. The aim is to remove water and air from beneath the carrier film without stretching, tearing or moving the marking.

This Gundam waterslide decal guide covers bare plastic and painted builds, plus the correct role of a Gunpla decal solution. Hobbyco's Gundam and Gunpla range includes kits, tools, decals and finishing accessories across several grades and series. Product availability changes, so check the current listing before planning a build around a specific sheet.

TL;DR

• Confirm that the sheet contains waterslide decals. Foil stickers, marking seals and dry transfers use different methods.

• A smooth, clean surface reduces trapped air. A compatible gloss coat can help on painted, textured or matte surfaces, but it is not mandatory for every bare-plastic build.

• Follow the decal maker's soak instructions rather than using one fixed time for every sheet.

• Use a Gunpla decal solution sparingly and check whether it is a setter, softener or combined product.

• Remove excess liquid from the centre towards the edge, then leave the decal untouched until fully dry.

• This Gundam waterslide decal guide separates placement, softening, drying and sealing so each stage can be checked before the next.

Identify the Decal Type Before You Start

Gunpla kits can include different marking types. Waterslide decals normally remain on backing paper until water releases the adhesive layer. Self-adhesive stickers peel from the sheet, while dry transfers are rubbed onto the part. Do not soak a sticker or dry transfer.

Not every Gunpla kit includes waterslide decals. Bandai also sells separate Gundam Decal sheets for selected kits and general marking sets. Match the scale and intended mobile suit where required, then check the sheet instructions before cutting.

Gundam Waterslide Decal Guide: Surface Preparation

Wash or wipe away sanding dust, skin oil and polishing residue, then let the part dry. The decal needs an even surface. Heavy texture, dust or uncured paint can hold the carrier film away from the part and make silvering more visible.

When a gloss coat helps

A compatible gloss clear coat is useful over matte paint, rough paint or weathering layers because it creates a smoother surface for positioning and air removal. Let the paint and clear coat cure according to their instructions. Test the complete paint, clear and decal-solution system on a spare part first.

When bare plastic can work

Clean, smooth Gunpla plastic can accept waterslide decals without a compulsory gloss coat. A clear coat may still help protect panel lining, even out the finish or prepare for later weathering. The decision depends on the surface and the final finish, not on plastic being porous.

If panel lines are part of the finish, plan the layer order before starting. Hobbyco's panel-lining guide explains the main liner types and their material considerations.

Tools for Clean Decal Placement

• Sharp scissors or a hobby knife and cutting mat

• Fine tweezers for handling the backing paper

• A shallow dish of clean, room-temperature water

• A soft brush for sliding and positioning the decal

• Lint-free tissue, a soft cloth or cotton swab for removing liquid

• A compatible setter or softener when the surface needs it

Keep a spare plastic part or painted spoon nearby for testing. A Gunpla decal solution can change the behaviour of both the decal film and the finish beneath it, especially when a stronger softener is used.

How to Apply Gunpla Waterslide Decals Step by Step

1. Cut out one marking

Cut around the marking without damaging nearby designs. Some sheets use individual carrier film around each image, while others use a larger continuous film. Trim closer only when the sheet design and your handling skills make that useful.

2. Wet the decal according to its instructions

Place the cut section in water for the time recommended by the maker. Hobbyco's Bandai Gundam Decal listings commonly state 10 to 30 seconds, but other brands can differ. Remove the backing before the decal floats away and wait until the image begins to slide with gentle pressure.

3. Prepare the placement area

Moisten the location with clean water or the setter recommended for the chosen system. The thin liquid layer gives you time to align the marking. Do not flood joints, seams or unsealed electronics.

4. Slide and align the decal

Hold the backing close to the part and use a damp brush to slide the decal into place. Nudge it into alignment while the film still moves freely. Avoid pulling a small decal with dry tweezers because the film can stretch or fold.

5. Remove water and air

Steady the decal, then roll a damp cotton swab or press a soft cloth from the centre towards the edge. Use light pressure and repeat until the marking sits flat. This stage is central to preventing silvering.

6. Add softener only when needed

Use the selected Gunpla decal solution as its label directs. A softener helps film conform over curves, rivets and recessed details. Stronger formulas may wrinkle the film temporarily and can affect some painted surfaces, so apply a small amount and do not touch the decal while it reacts.

7. Leave the decal to dry

Once the liquid is removed and the decal has settled, stop adjusting it. Drying time changes with the product, film thickness, temperature and humidity. Continue only when the marking is flat and no moisture remains.

How a Gunpla Decal Solution Helps

Decal products do not all perform the same job. A setter promotes placement and adhesion, a softener relaxes the film around surface detail, and some products combine both functions. Read the label rather than assuming one brand follows another brand's sequence.

Tamiya Mark Fit, for example, is applied to the placement area and then over the decal, followed by gentle pressure and complete drying. Tamiya also warns that its stronger formula may damage some painted surfaces, particularly acrylic paint. The safest Gundam waterslide decal guide is the instruction for the exact decal, solution and paint system in front of you.

Curves, Panel Lines and Other Difficult Areas

Curved shoulder armour and raised details need more time than flat panels. Start with the mildest compatible method, remove the liquid and let the film settle. Add softener in controlled passes rather than saturating the marking at once.

When learning how to apply Gunpla waterslide decals across a panel line, allow the decal to settle before encouraging it into the recess with a soft brush or cotton swab. Cutting the film should be a last resort. If a cut is needed at a deep separation line, use a fresh blade only after the decal has dried, then reseal the edge carefully.

Preventing and Fixing Silvering

Silvering is the pale or reflective appearance of tiny air gaps beneath transparent carrier film. It is most visible over dark colours and textured finishes. Prevention is easier than repair.

If a fresh decal shows a small air pocket, first try gentle centre-to-edge pressure while it can still move. For a dry decal, test any repair on a spare marking. A needle or blade can permanently damage the image or paint, so use that method only when replacement is not the better option.

Drying, Sealing and Final Finish

Let all decals dry completely before clear coating. Use the decal, solution and topcoat makers' stated times, and allow longer in cool or humid conditions. There is no universal 12-hour or 24-hour rule that overrides the products being used.

A compatible topcoat can protect the markings and unify the finish. Apply light mist coats first, especially over delicate decals or unfamiliar paint. Gloss, semi-gloss and matte finishes can all work when the layers are compatible and fully cured. Test the sequence before coating the completed model.

Current Gunpla Decal Options at Hobbyco

Hobbyco's current Gunpla decal collection includes kit-specific and multiuse sheets. Prices, promotions and availability can change.

Check scale, mobile suit and sheet number before ordering. Some markings are designed for one kit, while multiuse sheets allow more freedom. A Gundam waterslide decal guide cannot replace the compatibility details on the product page.

Frequently Asked Questions

Q: Do I need to paint my Gunpla before applying waterslide decals?

No. Waterslide decals can be applied to clean, smooth bare plastic or to a cured painted finish. A compatible gloss coat is useful when paint is matte or textured, when panel lining needs protection, or when you want more freedom to position the decal. Test clear coats and solutions before using them on the model.

Q: What causes silvering on waterslide decals and how do I fix it once it has happened?

Silvering is caused by small air gaps beneath transparent carrier film. If the decal is still movable, gently work water and air towards the edge. Once dry, a compatible softener may help, but test first. Severe silvering may require removing the decal, smoothing the surface and applying a replacement.

Q: Can I apply waterslide decals over panel line washes?

Yes, when the panel-line product is fully dry and compatible with the decal solution. Seal the wash first when its chemistry could react with water, solvent or handling. Test the full layer sequence on spare plastic because panel liners, paints, clear coats and decal products vary.

Q: How long should I wait between applying decals and spraying a topcoat?

Follow the stated drying times for the decal solution and topcoat. Wait until the decal is completely dry, flat and free of trapped moisture. Cool or humid conditions can extend drying. Begin the compatible topcoat with light mist coats rather than one heavy wet coat.

Q: Where can I buy waterslide decal supplies in Australia without waiting for overseas shipping?

Hobbyco lists Bandai Gundam Decal sheets and finishing products online, with product pages showing current stock and store availability. Check the Gunpla range and decal collection for the required scale, kit and Gunpla decal solution before ordering. Availability differs by product and location.

A Clean Process Produces Cleaner Markings

The reliable way to learn how to apply Gunpla waterslide decals is to work one marking at a time. Confirm the decal type, prepare a smooth surface, follow the sheet's soak time, align while wet, remove trapped liquid and let each marking dry before sealing.

Keep this Gundam waterslide decal guide beside the workbench for the sequence, but let the exact product instructions decide soak time, solution strength and drying. A carefully chosen Gunpla decal solution is helpful when the surface demands it, not a substitute for clean preparation and patient placement.