Acrylic vs. Silicone Caulking: What to Use for My Project?

Acrylic vs. Silicone Caulk

Both acrylic and silicone caulking has a similar function.

To seal cracks, insulate against cold or hot air, and prevent moisture from passing through, but what they are made from will dictate their use for your project.

Understanding the attributes and differences between acrylic and silicone caulking will help you choose the right one.

So, let’s dive right in by knowing about both…


Acrylic Caulk


Also known as latex-based caulks this type of caulking tends to be more popular than its silicone counterpart.

Mostly because acrylic caulking is easy to use and can clean up quickly.

In addition, the clean seal that it provides is perfect for painting projects.

Cracks in the woodwork, ceiling, and walls can be quickly filled and fixed with acrylic caulking.

Acrylic caulking is an excellent insulator and is perfect to use around doors, electrical outlets, and windows as well.

Its one downside though is that it does not do well when coming into contact with water.

When exposed to too much moisture, acrylic caulks tend to shrink which will create gaps over time.


Silicone Caulk


Sometimes called rubberized silicone, this is a strong caulking product that keeps its flexibility over time.

Unlike acrylic caulking, silicone is quite good as a waterproof seal.

It will not shrink or crack when exposed to water. This is why you often see it used on toilets, showers, tubs, sinks, and other plumbing fixtures.

Its waterproof nature also makes it perfect for outdoor use, especially under wet weather conditions.

This is why silicone caulking is often used on the outside of homes and other structures that require waterproofing.

However, it’s one downside is that because silicone (present in the caulk) repels water, it also means it repels paint.

Therefore, it is not recommended that you use silicone caulking for painting projects.

It will keep the paint from bonding and can cause peels and cracks fast.


Acrylic vs. Silicone Caulking


Although silicone and acrylic caulk is similar in nature and looks rubbery when cured on the surface, the difference lies in the environment and surfaces where they can be used.

Both acrylic and silicone caulking can be used to seal up most gaps in home interiors.

The exception is that silicone is best used for humid areas such as the bathroom and kitchen.

The only exception would be if these areas are to be painted in which case acrylic caulking is recommended.

In addition, for outdoor applications that will not be painted, silicone is the superior caulking product.

The good thing is it’s available in various different colors, (including clear) which does not turn yellow very fast.

Latex CaulkSilicone Caulk
PaintableCannot be painted over
Is non-elastic and not waterproofElastic waterproof sealant
Can shrink or crack in the waterDoes not shrink or crack in the water
Can last for approximately 5-6 yearsCan last for approximately 15-20 years
Dries quickly and becomes very hard when dryCold and heat resistant, better for larger joints

When to use polyurethane caulk?

Although silicone caulk adheres very well to almost any material, it does not work very well to seal around wood surfaces.

That’s where polyurethane caulk comes in handy.

Polyurethane caulk is known for its flexibility and can be used on wood and other surfaces that need to be painted.

However, the main drawback of polyurethane caulk is it does not hold up as well as silicone caulk on surfaces that are exposed to direct sunlight.

So, if you need to caulk and paint wood surfaces that are away from direct sunlight it’s good to use polyurethane caulk.

Polyurethane caulk is easier to apply, and clean up than silicone caulk.  Plus, it is less expensive.


Tips for Applying the Caulking


To apply the right amount of caulk, it is recommended that you cut the tip at a 45-degree angle.

This will allow for better control of the amount of caulk being applied to the opening.

You should cut as small an opening as possible, so you can control the exact amount of caulk that is needed.

The goal is to create a neat line of caulk that does not require any messy clean-up.

Use good quality caulk, clean the surface thoroughly, and apply it directly to the opening.

Once it is set, use a primer, sealer, or undercoat to cover the caulk if it is to be painted over.

Instead of trying to apply a single, big glob of caulk, think about applying a few small layers instead.

This will not only seal up the opening better it will reduce the cleanup time.

Plus, be sure to have a good scraper and some rags or clothes to speed up the cleaning process.

Given how fast the caulk can dry, you should clean any tools and equipment that touch the caulk quickly to avoid any issues later on.


Should I Caulk or Paint the Surface First?


If you need to paint the surface you are caulking, remember – latex-based caulks are supposed to be used under the paint as they are paintable and long-lasting.

Then comes the sequence in which you need to apply the paint or caulk.

Usually, for indoor surfaces, you should put the caulk first and then the paint.

This will hide the caulk and will make the surface look better.

However, if the surface is exposed to polluted air particles, dirt, or grime (like outdoors) it’s best to do the opposite.

Since the exterior surfaces are not protected and are exposed to various harmful materials (including harsh UV sun rays and moisture), the specks of dirt can stick to the caulk – if you do the caulking first.

These dirt particles will affect the paint adhesion and can become visible if you paint over the caulking afterward.

It’s therefore good to do the exterior painting first and then follow up with caulking.

There is however a drawback when you follow this outdoor caulking & painting sequence – your exterior designs will not look pleasing with the caulk residue left behind.

To fix this issue, it’s good to choose a clear transparent caulk that becomes invisible after application.

You can even pick the same color caulk (from the range of colored caulks available) which will blend perfectly well with the exterior paint colors.

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