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ICSC 661 Primer is a high build, two part polyamide cure epoxy. It displays outstanding adhesion to steel substrates and is the choice when harsh conditions are to be encountered. ICSC 661 Epoxy exhibits excellent durability against chemical fumes, solvent and alkaline solutions, severe weathering conditions, and salt water immersion. It not only acts as a superior base coat in an all epoxy system, but can also be used successfully as a primer for polyurethane topcoats. Because ICSC 661 is a catalyzed system and forms an incredibly tough film when cured, it offers outstanding resistance to abrasion.
ICSC 661 Epoxy Primer exhibits excellent resistance to salt water corrosion and is used extensively in marine applications. Such uses include rig platforms, walkways, barges, etc. that are exposed to the harsh attacks of salt spray.
Refineries are another area of successful application of ICSC 661. It provides a reliable base coat to the exterior of storage tanks and buildings that are continually exposed to the detriments of chemical fumes. Because the cured epoxy is relatively inflexible, polyamide epoxies should not be used in applications where the substrate is likely to be flexed.
To obtain maximum service life from an epoxy coating system, the steel substrate should be sandblasted in accordance with SSPC-SP5. If sandblasting is not practical, mechanical power cleaning (SSPC-SP3) may be substituted, although this will to some degree reduce the overall performance of the coating. In either case, the surface should be free of all loose paint, moisture, grease, dirt, oil, and rust. The epoxy may be applied by brush, roller, or by conventional or airIess spray.
The epoxy primer should be applied in one or two coats with a wet film thickness of 6-8 mils per coat. This will yield 4-5 mils of dry film thickness per coat. This prime coat can then be topcoated with one of the ICSC polyamide epoxy topcoats, such as 670 White, to complete the system. For more severe applications, it is recommended that the total dry film thickness should be increased to 15-20 mils (applied in 3-4 coats). For most average applications, a two coat system consisting of 10 mils of dry film should prove sufficient.
After thoroughly mixing the two components of the epoxy as per instructions, the mixture MUST be allowed to stand for 30 minutes before use. This incubation time permits the epoxy to properly begin its reaction before application. This sweat-in time must be observed for all polyamide epoxies.