Can you use masonry paint on slate?

Slate can be a tricky surface to paint and it is probably going to be used in an environment where it is exposed to the elements, because of this you are probably wondering if you can use masonry paint on slate? Well, let’s find out together. I had an old broken slate tile lying around the workshop along with a couple of tins of masonry paint. So I got to painting and then tested the results, lets see how the masonry paint got on.

Can you use masonry paint on slate?

Yes. My test showed that the masonry paint adhered well to the slate and the colour also covered well. After testing the finish outside in the elements I can safely say that the masonry paint has stuck to the slate and not faded or weathered at all.

My test

This is a simple test, but one that will show whether you can or can’t paint slate with masonry paint. I have an old slate tile and two different types of masonry paint. I am going to paint the slate and then test if it has stuck. After this, the slate will be moved outside and left exposed to the elements. I will report back with regular updates to see how well the paint is faring.

The old slate tile we will be painting
The old slate tile we will be painting

Painting the slate

I will be using Sandtex trade as well as the regular Sandtex. The trade paint is mid stone while the regular one is white. This will also help show us how different colours cover on a dark material like slate.

The two masonry paints i will be using
The two masonry paints I will be using

I just used a regular paintbrush to apply the paints. The smooth surface of the slate was really quick and easy to paint, so far so good.

Painting the slate with masonry paint
Painting the slate with masonry paint

The white did not cover as well as the stone but this was always to be expected. Two coats of white will do the trick whereas you may get away with just one of the mid-stone.

The painting is done
The painting is done

So that’s the painting part of the test completed. The slate was nice and easy to paint and as long as it sticks well and the protection lasts then this is definitely a job anyone can do.

Adhesion

So now comes the time to test how well the paint has stuck to the slate. For this, I used a rough cut piece of timber and run it across the surface of the paint fairly roughly. If any paint has not properly stuck to the slate this is where it would come off.

The results are in and I’m pleased to say there was no chipping at all. So the paint has firmly stuck to the surface of the slate, onto the next test.

Weathering

How well will the painted slate hold up when left exposed to the elements? There’s only one way to know for sure, leave it exposed to the elements and report back on the results. So I moved the slate into my sample pile and will update you with the results.

The slate sample left outside
The slate sample left outside

Learn More About Masonry Paint

This article is part of our masonry paint section, learn more about masonry paint with the following articles:

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Sam Wood

Wood by name, wood by nature. I am a fully qualified, time-served, award-winning joiner with an NVQ Level 3 in Carpentry and Joinery as well as an HNC in Construction. Beyond my joinery qualifications, I have also earned a degree in building surveying. I believe these qualifications make me perfectly positioned to provide expert advice on many different areas of DIY as well as share all of the tips I have picked up in over a decade working on building sites!

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