Surface Preparation

Optimum paint performance is possible only when the surface has been properly prepared. Proper surface preparation is of the utmost importance to receive the durability which can be expected from MasterKote® primers and enamels.

Before painting, all rust and loose paint must be removed. This can be accomplished through sandblasing or through other methods. If sandblasting, sandblast to a "commercial blast" (Steel Structures Painting Council Specification SSPC-SP 6-63). Blow dust and grit off the surface with dry air. If not sandblasting, it is important to remove all loose rust and old paint which is not tightly bound to the surface by wire-brushing or scraping. Hand sand with medium-grit sandpaper all pitted, rusty areas and old paint which is still extremely "glossy". Wipe off dirt accumulation with clean rags. In areas where rust cannot be completely removed, such as hinges and crevices, applying CORROSEAL® will form a non-rusting barrier over the rust.

The newly-cleaned surface should be primed before any rust appears on the surface. Whenever it is impossible to prime metal the same day it is blasted, applying PENETROL® will delay flash rusting. Prime within 48 hours after application of PENETROL®. If one-third of the surface is rusty or pitted, it is best to prime the entire surface. If there is only minor rust or damage, double spot-prime to build adequate thickness of paint film in bare areas.

Coatings should be applied at temperatures above 50 F. Do not paint metal which is damp, either from rain or condensation, or from heavy gas flow.

For best results, prime surface with two coats of MasterKote® Zinc Chromate Primer, followed by the preferred colour of MasterKote® Polyurethane or Silicone Alkyd Enamel. Be sure primers and paints are mixed thoroughly before application, and allow 24 hours' drying time between coats.

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The table below is a reasonably accurate guide to paint coverage. Depending on the surface and the painter, coverage can vary, however it is strongly advised not to spread paint too thin as this can shorten its' protective life and hasten repainting time.