Protal ST Epoxy Mastic by Denso

Application

Prepare surfaces by removing all loose scale, rust or other foreign matter in accordance to SSPC-SP2 “Hand Tool Cleaning” or SP3 “Power Tool Cleaning”. High pressure water wash of 3,000 - 7,000 psi is also suitable. This can be achieved using power brushing or machine grinding. If the surface is severely corroded, chipping hammers and needle guns will be required. The surface should finally be cleaned with a vacuum cleaner, clean dry with compressed air or a clean brush. The steel should then have a faint metallic sheen. Use as supplied in pre-weighed packs Part A (base component) with Part B (hardener). Pour all of Part B into Part A and thoroughly mix with a power whip for at least 2 minutes.

The substrate temperature must be a minimum of 5°F (3°C) above the dew point temperature before proceeding with the coating operation. The first coat can then be applied by brush or spray to a wet film thickness of 10 mils (8 mils DFT). Check the film thickness of the coating regularly with a wet film gauge during application. Minimum wait time for overcoating is 4 hours at 77°F (25°C).

Spraying is carried out using a 45:1 airless spray pump and a 21 to 31 thousands of an inch tip. Below 59°F (15°C), add 5% Denso Protal Thinner No. 55. Apply the second coat at 10 mils wet film thickness in the same manner as the first. When dry, a final weather resistant top coat such as a water based acrylic or polyurethane can be applied by brush or spray.

Technical Data

Handling & Storage