PPG Training

Custom Restoration Guide 2018

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130 CLEARCOAT APPLICATION PD-1730 Caution: Wear the proper safety protection when sanding, cleaning, mixing and spraying all materials included within this process. IMPORTANT Custom and restoration shops often apply a minimum of 4-5 coats of clear, while collision repair shops typically apply only 2-3 coats. Custom jobs with multiple colors may require the clearcoat process to be repeated 3 times or more to level out the paint edges. Avoid applying 5 or more heavy coats of clear at one time. The dry time will be considerably slower. See Slow Coat Process, Step 3, for the proper steps when applying a large number of coats. Reducer and hardener selections play a critical role. The slower choices will lead to better results. 1 Allow basecoat to flash an appropriate amount of time before beginning the clearcoat application process. This provides more time for the basecoat reducer to evaporate and minimizes the risk that the reducer will get trapped under the clearcoat and create hazing or dieback. 2 Apply 2-3 wet coats of clearcoat to the entire vehicle according to the directions found in the PDS. Allow proper flash time between coats. Each coat should appear like a final coat. Too light of an application between coats may lead to lifting. Waiting too long between coats may lead to increased texture (orange peel). 3 FLOW COAT PROCESS: There are occasions where it is necessary to apply multiple layers of clear. Burying graphics is one example. It's recommended that desired film build be achieved by multiple applications rather than by multiple coats in a single application. 1) Apply 3-4 coats of clear, each appearing like a final coat. Dry overnight. 2) Flat sand with P500-600 grit sandpaper. Use caution on edges and peaks to avoid cut-throughs. 3) Blow away sanding dust and clean with an appropriate PPG cleaner. 4) Apply an additional 2 coats of the same clear. 5) Dry overnight. 6) If desired clear thickness has been achieved, proceed to #4 below. Steps 5-6 may be repeated again if additional clearcoat thickness is needed. 4 Proceed with Finished Paint Procedures: Removing Defects PD-0800M Buffing and Polishing PD-1805 Final Cleaning and Detail PD-0810M

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