Throughout the year, our Technical Team and social media channels get a lot of questions about the Boysen Plexibond Cementitious Waterproofing System. By the way, hindi siya Flexibond, Plexibond siya, with a P as in Pinas. If you search for Plexibond in this Let it B blog, you will find seven posts about it. Here they are:

How to Use Boysen Plexibond – Waterproofing Your Roofs and Walls
Product Highlight: Boysen Plexibond
Boysen Plexibond Dos and Don’ts
Waterproof Your Home with Boysen Plexibond
No, You Can’t Use Boysen Plexibond on Its Own
Your Comprehensive Guide to Boysen Plexibond

If you’ve read all the six posts above, try this quiz to test your knowledge.

Frequently Asked Questions about Boysen Plexibond

Boysen Plexibond is a cementitious waterproofing system. It is a specially formulated, water-based acrylic polymer designed for mixing with Portland cement before application. Mix 6.5 to 7.5 kgs of cement to 4 liters of Plexibond. Do not add anything else to the mixture.

On which surface can I use Boysen Plexibond?

Plexibond can be used on a BARE concrete surface. In other words, the surface must have no paint and no tiles. The reason why Plexibond has to be applied on bare concrete is because the mixture of acrylic polymer and cement weighs heavier than a usual coating. Therefore, it needs a bare and sturdy surface to adhere to.

If the surface has been painted, scrape off the paint first, then prepare the surface properly before you apply Plexibond to ensure a leak-proof paint job. Read this post to know more about surface preparation for concrete walls that have been painted.

You cannot use Plexibond in submerged areas like pools, ponds, or cisterns. Plexibond can’t swim.

Where can I  use Boysen Plexibond?

Common applications are on:

  • firewall
  • ledge/canopy
  • concrete gutter
  • parapet wall

Pwede bang hindi haluan ng semento?
Pwede bang tile grout / tile adhesive / putty / skimcoat nalang ang ihalo?
Pwede bang pintura nalang ihalo (para may kulay na)?

Ang sagot ay NO, NO, and NO.

Plexibond is NOT a stand-alone product. It has to be mixed with Portland Cement, and ONLY Portland Cement. Again, the correct ratio is 6.5 to 7.5 kgs of Portland Cement to 4 Liters of Plexibond.

And to those who asked the third question, brownie points for trying to think of ways to cut the process. But if you do this, you will have to redo the whole process from beginning to end in the right way, so in the end it will take longer and it will be more expensive.

Watch this video tutorial to learn how to use Boysen Plexibond. For written instructions, visit the website.

Pwede bang pinturahan ang pader na may Boysen Plexibond?
Kailangan bang pinturahan ang pader kapag may Boysen Plexibond?

Yes, we highly recommend a paint system for maximum durability. Here are the Boysen products you can use:

Pwede bang ipahid sa loob ng bahay ang Boysen Plexibond?

Yes, you can use Plexibond as a waterproofing system for your bathroom, provided that there is no existing paint and that tiles will be installed after application.

On which side of the wall do I apply Boysen Plexibond?

Apply it on the positive side of the wall, meaning, that side where the water pressure comes from.

Can I use Boysen Plexibond to cover cracks?

Yes, you can use Plexibond, but only for hairline cracks. It will not bridge gaps and active structural cracks. In such cases, call a professional like a contractor or a structural engineer.

Pagkatapos kong mag Plexibond, pwede ko bang masilyahan ng Skimcoat para makinis?

No. Ang Konstrukt Permaplast K-201 High Performance Acrylic Skimcoat ay pinapahid as alternative plastering on bare concrete walls. Pinapahid ito bago maglagay ng Plexibond. So first Skimcoat and then Plexibond.

Call the Boysen Technical Team

The application of Boysen Plexibond is fairly complex, thus we do not recommend it for DIY projects. You need professional painters to do the job for you.

But even if you will not be applying Plexibond yourself, it always helps to have an understanding of the process. Our Technical Team is ready to answer any questions you may have about the product. Just call (02) 8363-9738 local 417 to 418 during office hours.


Annie is the Managing Editor of Let it B | MyBoysen Blog. An unrepentant workaholic, she runs this blog and her own company Talking Lions ( She thrives on collaborating with people who are good at what they do, and working together with them to create something special. Annie learned interior styling while managing her own wholesale business in the Netherlands, importing high-end, handmade home furnishings to stock four outlets and a showroom in the country.

Write A Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.