Good day!

Is it alright to mix Plexibond and tile grout? I’m just worried because from what I know these can’t be mixed together.

We are currently having problems with leaks coming from the second-floor shower area. What our workers did was after removing the old grout, they mixed Boysen Plexibond and the new grout together. They have this notion that it’s going to be more resistant to leakage compared to using only the grout.

I’m not so sure about it that’s why I wanted to ask and consult you.

Hope to hear from you soon!

Boysen User J

Good day to you too, Boysen User J!

Guess what—you are correct. It’s not advisable to mix Boysen Plexibond and tile grout together and use the resulting mixture for grouting. Sadly, there’s a high chance it won’t end up as the workers think it will.

Paint TechTalk with Lettie: Can I Mix Plexibond and Tile Grout Together? | MyBoysen

Boysen Plexibond is only recommended to be mixed with Portland cement. Every 4 liters of the waterproofing product is added to 6.5 to 7.5 kgs of cement.

Taking a look at the composition of tile grout, a typical tile grout product will contain cement, yes, but also a list of other things including an aggregate, a filler, an expansion agent, and more. All these can affect how effective both the Plexibond and tile grout will be once they’re mixed together.

For one, per the Boysen Technical Services Department, there’s a very real possibility that you won’t get the best adhesion and performance both products are typically capable of when they’re used as intended.

To cut a long story short, because Plexibond was not made to be mixed with tile grout, the workers working on your second-floor shower area will likely not get the results they hoped for.

Paint TechTalk with Lettie: Can I Mix Plexibond and Tile Grout Together? | MyBoysen

With that said, you still can use Plexibond to waterproof your bathroom! First, make sure you’re working on a bare concrete surface (this is important!). Then, mix and apply Plexibond per manufacturer instructions (watch a tutorial here). Aim for a smooth finish so you have an even surface to work with when it’s time to place your tiles. Then, apply your tiles as you would. Job done!

Hope this helps and good luck with your shower area.

Your painting partner,

Need advice? Paint TechTalk with Lettie is here for you. Comment your painting question below or send an email to


Jill is a writer on a continuous journey to learn about paint and share them with you, the reader. She has an interest in the technical side of things but also thoroughly enjoys playing with colors. She likes calm greens, quiet blues, and mellow yellows best.

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