This is one of the more unusual applications we have been asked to advise on. At the end of it all, it is all about the type of substrate to be coated, and the requirements of the dry paint film, just as in any other case. Rat cages are supplied with a thin powder coated layer, with limited resistance to rat urine. After a short period of time, the powder coating is broken down and the exposed metal begins to rust.
To re-coat it is necessary to sand the substrate down to bright metal where rusted, and to an even matt finish where the powder coated layer is still intact, before applying two coats of Chlorinated Rubber Enamel at 4 hr intervals.
Chlorinated Rubber Enamels are self priming on metal surfaces due to the very good adhesion to the substrate and very low moisture and oxygen permeability. They are resistant to both acids and alkalis, and non-toxic in the dry state. To ensure that the coating has dried sufficiently before the cage is re-used, it should be left for 24 hrs after application of the second coat.
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