Exterior Steel Tank Overcoat Systems

Surface Preparation: Minimum surface preparation of bare steel and previously painted steel requires a cleanliness level as defined by SSPC-SP WJ-4/NACE WJ-4 Light Cleaning by use of Low Pressure Water Cleaning (LP WC) between 3,500 and 5,000 psi using a 0 degree rotating nozzle. If all visible contaminates, loose mill scale, loose rust and other corrosion products, and loose paint have not been removed, SSPC-SP2 Hand Tool Cleaning or SSPC-SP3 Power Tool Cleaning should be employed until the surface cleanliness definition is met.  All surfaces shall be clean, dry and no less than 5°F above the dew point during application and cure (dry to recoat).

Option I (Dryfall System)

Spot Prime Bare/Corroded: Tnemec Series 118 | Uni-Bond Mastic at 6.0 to 8.0 mils DFT (spray-applied)

Full Prime/Tie-Coat: Tnemec Series 118 | Uni-Bond Mastic at 6.0 to 8.0 mils DFT (spray-applied)

Finish Coat:  Series 1028 | Enduratone gloss or Series 1029 | Enduratone semi-gloss; 2.0 to 3.0 mils DFT per coat

Option II

Spot Prime Bare:  Series 135 | Chembuild; 4.0 to 6.0 mils DFT

Tie-Coat:  Tnemec Series 115 | Uni-Bond DF; 2.0 to 4.0 mils DFT

Finish Coat:  Tnemec Series 1028 | Enduratone; 2.0 to 3.0 mils DFT

Option III

Spot Prime Bare:  Series 135 | Chembuild; 4.0 to 6.0 mils DFT

Tie-Coat/Finish Coat:  Series 30 | Spra-Saf EN;2.0 to 4.0 mils DFT per coat