function updateHeaderHeight() {
        // Get the height of #brx-header
        const headerHeight = document.querySelector('#brx-header').offsetHeight;
          
        // Store the height in the CSS custom property --header-height
        document.documentElement.style.setProperty('--brxw-header-height', headerHeight + 'px');
    }

    // Execute the function as soon as the document is ready
    document.addEventListener('DOMContentLoaded', function() {
        updateHeaderHeight();  // Initial update of header height when the document is ready

        // Update the header height on window resize and orientation change
        window.addEventListener('resize', updateHeaderHeight);
        window.addEventListener('orientationchange', updateHeaderHeight);
});

Jotun Epoxy Paint Calculator — Jotamastic 87 & 90 Mix Ratio by Weight

If you're using Jotamastic 87 or 90 on your van build, it's important to get the two-part mix spot on. Mixing by weight is more accurate than volume.

This calculator helps you get the exact base/hardener mixture right. It also calculates how much paint you'll need, given the surface area. 

📝 Note: This is specifically for Jotun paints — the two types recommended for protecting your van conversion: Jotun 87 and Jotun 90. Either is fine for heavy-duty underside protection of the whole van.

Jotun epoxy is what I recommend in my van conversion course. The 'van preparation' chapter walks you through the process of protecting your van from corrosion and rust.