How to Make Paint Waterproof: 2 Simple Methods

Not all paint is waterproof, thankfully it’s not too hard to waterproof paint.

It can easily be done by either applying a waterproof sealant over the paint or by mixing an additive into your paint before application.

how to waterproof paint

What Types of Paint Need Waterproofing?

If you’re painting with oil, you don’t need to waterproof your paint. Oil paints are naturally water-resistant.

So, they can handle high humidity or rain, making them ideal for painting outdoors. Oil paints are also relatively thick and have minimal water-soluble components, which means they hold up well to water.

The only issue people have with oil-based paints is that they tend to leave a sticky residue on the surface when they dry.

However, if you’re working with acrylic or latex paints, you should definitely consider waterproofing them. The reason is that they’re both water-based. In other words they’re not water-resistant.

Another problem is that acrylic paints can be more vulnerable to mold and mildew if they’re constantly exposed to moisture.

How to Waterproof Paint:

There are two effective ways to waterproof paint, these are:

1. Use a Waterproof Sealant

If you’re painting with acrylic, latex or even chalk paint, you can protect your artwork with a quick-drying sealant like water-based acrylic or vinyl sealants.

While some sealants can be used on almost any surface, including metal, wood, and plastic, others are designed for specific materials.

red spray paint

So, make sure you choose the right sealant for your project.

Alternatively, you can go for a polyurethane varnish. Just be prepared to wait around 48 hours for the varnish to dry.

Still it’s worth the wait when you see the end result. You’ll notice that the painted surface has a nice sheen, as well as long-lasting protection against moisture.

Both types are easy to use, as you can see below:

  1. Let your painting dry thoroughly.
  2. Next, apply an even layer of sealant.
  3. Then, give the sealant time to dry, depending on the type of sealant you’re using.
  4. Spraying a second layer is optional, but keep in mind that it offers added protection while further enhancing the color.

2. Mix in a Paint Additive

The simplest way to make your acrylic paint waterproof is by adding a paint additive. These additives are basically primers premixed with your paint, like Aquaseal Paint Additive.

They work by covering up defects in the coating. Yet, their best feature is their ability to make paint water-resistant.

mixing paint additive in

The good news is that you can easily find a wide variety of additives at any hardware store. In addition, it’s worth mentioning that latex paint additives work well with most types of paint.

It’s worth mentioning that there are waterproof additives for oil-based paints. That said, they aren’t as effective at making acrylic paint waterproof.

Also, always read the label before mixing in an additive to make sure it’s safe for the type of paint you’re using. Depending on the brand, you may be able to combine the additive right into your paint, or you may need to premix the two ingredients in a separate container.

Here’s how to mix them.

  1. Clean the surface thoroughly of any dust, debris, or grease.
  2. Next, paint the first layer using your choice of paint only without the additive.
  3. Let the first coat dry.
  4. Then, mix the latex paint additive thoroughly with your paint at a ratio of 1:4.
  5. Before you start painting, make sure to conduct a test patch on a small area.
  6. Paint the second layer using the mixture of paint and additive, then leave to dry.

Final Words

You’re now a bonafide expert on how to make paint waterproof. Whether painting is your hobby or full-time profession, protecting your painted surfaces is a must.

Luckily, the market is full of all kinds of sealants and waterproofing additives that do an excellent job of keeping your paint moisture-free.

Remember that different kinds of paints need different levels of protection. So, always make sure you’re providing them with the best waterproofing available.

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