General:
Paint systems which are resistant to particular chemicals such as alkalies, acids, solvents, detergents, oils, fats, etc., are frequently required. Where chemically resistant paints are required, two main types are available, namely:
- i) Epoxy Enamel, based on epoxy resins
- ii) Dekro Adthane Polyurethane Enamel (Urethane Acrylic)
It is essential to read thoroughly the comprehensive data sheets to ascertain the correct coating for the particular type of chemical resistance required. We recommend that one of our expert technicians be consulted before coating any important structure.
In each case careful attention must be given to preparation of surfaces, as thorough cleaning and preparation play a particularly important part in high chemical corrosion resistance. Thickness of the coating is of great importance where conditions are severe. Where these coatings have to be used primers and undercoats of the same type must generally be employed, as orthodox primers and undercoats are not always compatible.
Finally it should be noted that in constantly corrosive conditions individual coats would become contaminated if left for too long before further coats are applied. Successive coats should therefore be applied without delay.
Preparation:
New:
Prepare new surfaces as previously outlined under the appropriate headings.
Previously painted:
If in poor condition, remove all paint back to the original surface, by scraping, wirebrushing, burning, sanding or with Dekro Paint Stripper.
Dekro Epicon Epoxy Enamel may be applied satisfactorily over existing paint, provided it is hard, in good condition, cleaned down and lightly sanded. Some paints, however, may soften or lift and it is recommended to assess this by small-scale trials. If the existing paint is not satisfactory in this respect, it must be stripped to the original surface.