R307-343-5. Application Equipment Requirements

  (1) All coatings shall be applied using equipment having a minimum 65% transfer efficiency, except as allowed under R307-343-5(3) and operated according to the equipment manufacturer specifications. Equipment meeting the transfer efficiency requirement includes:

  (a) Brush, dip, or roll coating;

  (b) Electrostatic application; and

  (c) High volume, low pressure (HVLP) spray equipment.

  (2) Other coating application methods that achieve transfer efficiency equivalent to HVLP or electrostatic spray application methods may be used.

  (3) Conventional air spray methods may be used under the following circumstances:

  (a) To apply finishing materials that have no greater than 1.0 pound of VOC per pound of solids, as applied;

  (b) For touch-up and repair under the following circumstances:

  (i) The touch-up and repair occurs after completion of the finishing operation; or

  (ii) The touch-up and repair occurs after the application of stain and before the application of any other type of finishing material, and the materials used for touch-up and repair are applied from a container that has a volume of no more than 2.0 gallons;

  (c) When the spray gun is aimed and operated automatically, not manually;

  (d) When the emissions from the finishing application station are directed to a control device as specified in R307-343-6;

  (e) When the conventional air gun is used to apply no more than 10% of the total gallons of finishing material used during the calendar year; or

  (f) When the conventional air gun is used to apply stain on a part for which it is technically or economically infeasible to use any other spray application technology. The following criteria shall be used, either independently or in combination, to support the affected source's claim of technical or economic infeasibility:

  (i) The production speed is too high or the part shape is too complex for one operator to coat the part and the application station is not large enough to accommodate an additional operator; or

  (ii) The excessively large vertical spray area of the part makes it difficult to avoid sagging or runs in the stain.