Abstract
Powder coatings offer the most economical solution for coating hydraulic tubes, but several practical issues need to be resolved before going ahead with this strategy. If powders cannot be used then dip application of liquid coatings offers the next most efficient method, but even this option has potential difficulties associated with it, especially if two-component coatings are to be used. If spray application remains the last practical method, then electrostatic spray guns should be preferred to nonelectrostatic applications such as conventional air atomizing or HVLP. In most cases it is unlikely, but not impossible, that any of the spray methods will achieve TEs in the 80 to 90% range as can be achieved by either powder or dip coatings.
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