STD HARDENER NR 0.5L

System 20 National Rule Standard Hardener is compatible with both System 20 National Rule Primers and System 20 National Rule Clearcoats. The end result: An easy-to-use system with less products to stock. Compatible with 4:1 System 20 National Rule Primers Compatible with 4:1 and 2:1 System 20 National Rule Clearcoats Ideal for larger repairs