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Chapter 10- Touch-up, Recoat, and Stripping (eChapter from User's Guide to Powder Coating, Fourth Edition) Image

Chapter 10- Touch-up, Recoat, and Stripping (eChapter from User's Guide to Powder Coating, Fourth Edition)


Author(s)/Editor(s): Nicholas Liberto PE
Published By:
SME

Published: 02/28/2003
Product ID:
BK03PUB1_E_CH-10
ISBN:
978-1-62104-046-0

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SME Members: $ 8.00
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Description

The methods of part repair after powder coating can be put into two categories — touch-up and recoat. Touch-up repair is appropriate when a small area of the coated part is not covered and is unable to meet finishing specifications. When hanger marks are not acceptable, touch-up is required. Touch-up also may be used to repair slight damage from handling, machining, or welding during assembly. Touch-up is performed using a compatible liquid paint designed for spot application by the powder coating formulator. Recoat is required when a part is rejected because of a large surface area defect or when touch-up is not acceptable. At this point, there are a variety of options that should be considered carefully. Usually the rejected part can be repaired with a second coat. Another option is stripping and repainting the part. Stripping can also clean part hangers to provide a good ground for electrostatic spray. Usually the last alternative for part repair, stripping rejected parts can add greatly to production costs, as well as disrupt the production-line flow. Stripping coated parts becomes necessary, however, when poor pretreatment or touch-up causes the coating to be unacceptable and, therefore, rejected.