Steps and risers have always been the awkward part of a resin bound project. Standard binders sag on vertical surfaces, so the cleanest projects stopped where the surface turned upward. Not anymore.
Resin Mill Vertical is an extremely thixotropic version of our market-leading resin, developed so you can clad steps and other vertical surfaces with the same stone carpet finish as the rest of the project.
What is Resin Mill Vertical?
It is a UV stable, waterproof 3 part binder system that doubles as a primer for coved skirts and as the binding agent for laying resin bound stone vertically. It dries virtually water white and will not discolour with age, so your finished steps keep matching the surface around them.
What is in the KIT?
- 1.8kg of Resin Mill Vertical resin (0.9kg Part A + 0.9kg Part B)
- Stone Carpet Catalyst and a dosing syringe
- One 25kg bag of your chosen 1-3mm stone, available in 14 colours

One KIT covers approx 1m² or 5 linear metres of steps (assuming an average step of 200mm).
Good to know: one KIT mixes with approx 12.5kg of stone, about half of the 25kg bag supplied. Dusty natural aggregate takes the full 12.5kg; use less with coloured quartz or other non-dusty stone. The maximum recommended stone size is 2-3mm.
How is it applied?
- Thoroughly mix Part B into Part A.
- Add 10-15ml of catalyst with the syringe and mix well (25ml in winter months).
- Apply a liberal coat of the mixed resin to the vertical surface as a primer, typically 0.5kg or just over a quarter of the mix.
- Mix the remaining resin with approx 12.5kg of 1-3mm aggregate until all stones are evenly coated.
- Trowel the stone onto the vertical surface while the primer is still wet, at an even depth of 5-6mm.
Why you will want it on every project
UV stable and water white
No yellowing, no discolouring, no visible difference between your steps and the main surface as the years pass.
It stays where you put it
The extremely thixotropic formulation is made for vertical work: no sagging on risers, no slumping on coved skirts.
Pre-dosed and predictable
Everything arrives dosed for 1m², so there is no weighing on site and results stay consistent from step to step.
Calculate your kit in seconds
Enter your wall surface in the Vertical Binder KIT calculator on your B2B portal, pick your stone, and add everything to your cart in one go. Questions? Call us on +32 16 16 10 18 or email sales@resinmill.be.





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