| M-P21 2K Primer Surfacer Hardener |
| Characteristic | Hardener for 2K primer surfacer, used to dry and harden coating |
| Match with | M-P20 2K Primer surfacer, T-1/2/3 Thinner |
| Mix Ration (by volume) | M-P20 2K Primer Surfacer | M-P21 2K Primer Surfacer Hardener | T-1/2/3 Thinner |
| 4 Parts | 1 Part | 0.25-0.5 Parts |
| Using | Mix with 2K primer, and add thinner to mix |
| Remarks | Can not mix with 2K topcoat |
| Shelf Life | 1 years since the production date if sealed and kept in a cool and dry place |
high performance single-component acrylate