THE BRUSH BLOG
Stories, gear & friction.
Field notes, build logs, and everything we learn making climbing tools.
Fans, leaf blowers, and where a jet fan fits in bouldering
Climbers haul box fans and leaf blowers to the boulders for a reason. Here's what a fan does well, and why a jet fan like the ChalkBlaster is a different too...
Fans, leaf blowers, and where a jet fan fits in bouldering
Climbers haul box fans and leaf blowers to the boulders for a reason. Here's what a fan does well, and why ...
What our first production batch taught us that CAD couldn't
Building the first ChalkBlaster batch by hand was chaos. It also taught us things six months of CAD never c...
Climbing Brushes: The Complete Guide to Choosing and Using One (2026)
The complete climbing brush guide: how bristles, size, and technique decide your friction, how the climbing...
We Built It Wrong the First Time. Here's What Changed.
The first ChalkBlaster production run was slow and chaotic — on purpose. It exposed what CAD never could. B...
The Part That Took 15 Tries
The angle-adjustment system on the ChalkBlaster brush looks simple. It took 15 versions to get there. Here’...
How We Make the ChalkBlaster 20% Stronger — For Almost Nothing
The ChalkBlaster is built to be abused — thrown, stepped on, and pushed through sessions that would break l...
2026 Best Gifts for Climbers: 10 Things They'll Actually Use!
Buying for a climber is either easy or completely baffling. This list cuts through it — 10 gifts that actua...
Have Portable Fans for Bouldering Become Mainstream?
Adam Ondra just completed the most dominant bouldering run in recorded history V17 and four 8C flashes in 1...
I Was Banned From Using My Own Invention at a Competition
I invented a handheld electric climbing brush and brought it to the Danish Boulder Cup. An official told me...
Your Hands Are Dirtier Than You Think. The Unwritten Rules of Crag Etiquette.
Everyone brushes before they climb. Almost nobody thinks about what their bare hands do to a hold first. Se...
We Tried to Destroy our Own Product
We packed the motor with chalk, submerged it, blocked the airflow, and forced it to overheat. If it was goi...
We Built It Wrong 7 Times
Seven major redesigns, six months, and more broken prototypes than we'd like to admit — all bootstrapped fr...
What Is the Most Innovative and Best Climbing Brush of 2026?
The 2026 lineup. Every brush that matters — and one beyond the category entirely. Photo: Sweep Climbing...
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