If you're wondering what the difference between ARDITEX NA and ARDITEX CL is, then this video is here to help. Both products offer the exceptional performance that you would expect from an ARDEX product but both are designed for different applications. The main difference between ARDITEX NA and ARDITEX CL is that ARDITEX CL needs priming. For concrete and sand or cement screed, use ARDEX P 51 Primer diluted 1 part Primer to 3 parts Water. For non absorbent floors such as ARDEX DPMs or ceramic tiles use the ARDEX P 4 Primer. If you're priming your floor, ARDITEX CL is the perfect solution. With ARDITEX NA there’s no need to prime on problematic subfloors such as ceramic tiles and bitumen, reducing the need for extensive prep work saving you time and money. It’s also moisture tolerant meaning It can be applied below a DPM and direct to damp concrete