Priya Kapoor
If you're a model-painting enthusiast, you may have encountered the issue of sticky paint. This can happen when paint doesn't dry properly, or when using certain types of paint like enamel on plastic models, resulting in a tacky surface that can leave fingerprints or even peel off. So, what can be done to fix this sticky situation? Well, there are a few tricks you can try. Firstly, it's important to give paint ample drying time, sometimes even days, before handling or adding another coat. If that doesn't do the trick, you might need to switch to acrylic paints, which are water-based and less prone to stickiness. Additionally, you can try using a drying agent like Japan drier or Cobalt drier, mixed directly into the paint. For a quick fix, some suggest spreading talcum powder on the surface and then vacuuming it off, but always test this method in a small area first to avoid any unwanted residue.
Characteristics and values for reducing stickiness from model paint
| Characteristics | Values |
|---|---|
| Paint type | Enamel paints may react with the PVC in models, causing stickiness. Use acrylic paints instead. |
| Drying time | Allow ample time for paint to dry. Enamel paints may need a few days to dry completely. |
| Paint application | Avoid applying too many coats of paint too quickly. Ensure each coat is dry before applying the next. |
| Surface preparation | Attach models to a scrap piece of wood or metal while painting to avoid touching painted surfaces. |
| Sealant | Use a sealant like Testors Dull Cote to seal the paint and prevent stickiness. |
| Powder | Use fine talcum powder or baby powder to reduce stickiness. |
| Heat | Blow warm air across the surface to speed up evaporation and reduce stickiness. |
| Paint additives | Add a paint chemical like Japan drier or Cobalt drier to help with the drying process. |
| Surface protection | Place a cloth over the sticky surface to prevent objects from sticking and paint from peeling. |
| Paint removal | If paint remains sticky, remove it using a mixture of Pine-Sol and water, or mineral spirits and an acid brush. |
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What You'll Learn
Avoid oil-based enamel paints, use acrylic paints instead
When choosing paint for models, it is best to avoid oil-based enamel paints and instead opt for acrylic paints. Enamel paints are traditionally oil-based and, while they have excellent adhesive qualities and are very water-resistant, they have some significant drawbacks.
Firstly, oil-based enamel paints tend to separate when stored, requiring thorough mixing before use. They also give off fumes and need harsh chemicals for cleaning. The oil in these paints can cause them to yellow over time, particularly in areas with less sunlight, such as pantries or closets. This can make touch-ups difficult, as the new paint may not match the old.
Acrylic paints, on the other hand, are water-based and do not have the same separation issue as oil-based enamels. They are much easier to clean up, requiring just water, and are more environmentally friendly. Acrylics are also versatile, readily available, and affordable, making them a popular choice for artists and hobbyists. While they may not provide the same level of coverage as enamel paints and may require a primer on smooth surfaces, they are a safer and more practical option for most projects.
Additionally, oil-based enamel paints have a high VOC content. VOC stands for Volatile Organic Compounds, which are of concern from an environmental and health perspective. California has already banned the use of oil-based enamels for most applications due to their high VOC levels, and other places are moving in this direction. Therefore, it is advisable to choose acrylic paints over oil-based enamels to comply with environmental regulations and to avoid potential health risks.
In summary, when painting models, it is advisable to use acrylic paints instead of oil-based enamel paints. Acrylics are easier to work with, more environmentally friendly, and do not carry the same health risks as oil-based enamels. While they may not provide the same level of durability or coverage, they are a safer and more practical option overall.
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Use a chemical drier like Japan drier or Cobalt drier
If you want to remove the stickiness from model paint, you can use a chemical drier like Japan drier or Cobalt drier. These are metallic salts, usually cobalt, that act as catalysts aiding in the chemical linking of molecules. Japan drier is a blend of lead-free drying agents that accelerate the drying time of oil-based paints, varnishes, and enamels. It is 97% Naphtha and 3% cobalt compounds. Varnishes and paints containing oils such as linseed and tung dry by oxidation, absorbing oxygen from the air to solidify. The cobalt in Japan drier enhances the ability of the oils to absorb oxygen molecules.
Japan drier should be used in minimal amounts, as excess use can cause discolouration or cracking. It is added to the paint when it is applied and should only be added to the amount of product being used, as adding it to a can of product can cause gelling. It increases the gloss of the product and should be tested on a sample if a sheen level needs to be matched.
Sunnyside Xylol is commonly used to thin this type of paint. It is important to always consult and follow the paint manufacturer's directions and label warnings before thinning. Other petroleum distillates that can be used include mineral spirits, naphtha, kerosene, and gasoline.
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Use citrus-based cleaners
If you're dealing with sticky residue left behind by model paint, citrus-based cleaners can be a safe and effective solution. Citrus-based products are known for their ability to tackle tough, sticky substances without damaging the underlying surface. They are particularly useful for removing fresh paint, making them ideal for addressing paint-related stickiness.
There are several citrus-based cleaners available on the market, such as De-Solv-it® Citrus Solution™, Goo Gone, Orange Clean, and CitriStrip. These cleaners are designed to remove a variety of stubborn substances, including paint, stickers, gum, oil, and adhesive residue. They are safe to use on a wide range of surfaces, including skin, clothing, carpet, upholstery, and even automobile finishes.
When using a citrus-based cleaner, always follow the instructions on the product label. Generally, these cleaners do not require a soap and water rinse, making them convenient and easy to use. However, it's important to note that some citrus strippers contain wax to prevent drying, so you may need to use a mineral spirit or acetone to break down the wax before proceeding with your project.
Citrus-based cleaners are a gentle and biodegradable option for removing sticky paint residue. They are a popular choice for households and schools, as they effectively tackle a wide range of messes while being safe for children and various surfaces. By using these cleaners, you can confidently address the stickiness left behind by model paint without causing harm to your project or the surrounding area.
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Apply wax over the paint
Applying wax over paint can help seal the paint and give it a polished look. Here is a step-by-step guide on how to apply wax over paint:
Prepare the Surface:
Before applying wax, ensure that the painted surface is clean and free of any grease or residue. If the paint is sticky or has fingerprints, you can apply a thin coat of soft wax, such as Annie Sloan Soft Wax, to soften the underlying wax, making it easier to remove excess wax and reduce stickiness.
Choose the Right Wax:
Select a suitable wax for the job. Soft waxes, such as Annie Sloan Soft Wax, are ideal for chalk paint and can be used on various surfaces, including furniture. You can also use fine polishes and waxes, such as automotive wax on lacquer paints.
Apply the First Layer of Wax:
Using a stiff bristle brush, apply a thin coat of wax to small sections at a time. Work in manageable sections to avoid wax buildup. Smoothly cover the entire surface, but avoid applying too much wax, as it may become difficult to blend.
Wipe Away Excess Wax:
Use a soft, lint-free cloth, such as a microfiber cloth or a piece of cheesecloth, to wipe over the waxed surface and remove excess wax. Go over the wax in steady sweeps, following the direction of the grain. If the cloth becomes saturated with wax, switch to a clean side or use a fresh cloth.
Apply a Second Coat (Optional):
After 24 hours of drying, you may choose to apply a second coat of wax for added durability and protection. You can use clear wax for a subtle finish or dark wax for a distressed patina.
Sand and Burnish (Optional):
If desired, you can lightly sand the waxed surface or burnish the wax once it's dry to achieve a glossier finish. Sanding can also help smooth out any uneven areas or remove excess wax buildup.
Remember, once wax has been applied, no other protective finish can typically be added. Always allow sufficient drying time between coats and before handling the item.
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Seal the paint with Testors Dull Cote
Sealing paintwork with Testors Dull Cote is a great way to protect your models and miniatures. Dull Cote is a durable, non-yellowing lacquer that doesn't get sticky over time. It is a popular choice for those painting with acrylics, pastels, and earth pigments, as it holds its finish and never degrades the painted colours.
Testors Dull Cote is available as a spray or brush-on sealant, and it is easy to apply smoothly and evenly. It is important to follow the directions and spray from the correct distance, as spraying too close can cause bubbling. The sealant dries quickly, and it is recommended to let it sit overnight to ensure the finish is correct.
Dull Cote is a great final coat after applying decals, and it is perfect for protecting plastic models prior to weathering. It fills in gaps and brush strokes, creating a natural-looking paint scheme. It is also effective for repainting BJDs and vinyl dolls, keeping design details visible and leaving a smooth, matte finish.
Testors Dull Cote is a small can, and some customers have noted that it is expensive for the quantity. However, it is a high-quality product that provides excellent protection for your models and miniatures, ensuring they look fresh and preventing scratches and wear.
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Frequently asked questions
Enamel paints tend to stay sticky and react with the PVC used in models, so it is recommended to use acrylic paints instead. You can try to remove the sticky paint by mixing a solution of Pine-Sol and water (1 cup Pine-Sol to 2 cups of water), then soaking and scrubbing the model with an abrasive cleanser.
Before painting, ensure that you shake or stir the paint well. Allow ample time for each coat of paint to dry before applying the next one. You can also try attaching your model to a scrap piece of wood or metal while painting so that you don't have to touch the painted surfaces until they are dry.
You can try spreading a fine layer of talcum powder on the surface and then lightly vacuuming it off. Alternatively, you can add a layer of polyurethane to increase durability and eliminate the stickiness. However, if you plan to repaint the model, you will need to scuff the urethane first.
