ProChalk Permanent chalk for weatherproof and waterproof lines that aren’t going to go away any time soon. Most users are choosing this level of intensity for applications that are going to be covered. This level is engineered for more extreme conditions. Exterior applications include exterior layout, extreme conditions, concrete layout, long-term applications. INTERIOR OR EXTERIOR USE Applications include interior layout, as well as roofing, siding, and concrete. Permanency Colors Permanence Rank Best for Applications Include Standard Blue, White 1 Interior/Exterior Interior Layout, Roofing, Siding, Paneling High-Visibility Lime, Orange, Yellow 2 Exterior Corrections, Plumbing, Electrical, Roofing, Masonry Semi-Permanent Black, Red 3 Exterior Exterior Layout, Concrete Layout, Roofing, Metal Fabrication Permanent Black, Blue, Red 4 Exterior Exterior Layout, Concrete Layout, Extreme Conditions, Long Term Applications Ultimate Dye Black, Blue, Red 5 Exterior Exterior Layout, Concrete Layout, Extreme Conditions, Long Term Applications
