5. Primer Application - Coat parts to be painted with zinc chromate wash primer solution followed by a
coat of urethane primer solution. Coat fiberglass parts only with urethane primer solution.
Allow zinc chromate wash primer to dry 30 minutes minimum before applying urethane primer.
Allow urethane primer to dry two to four hours before applying urethane enamel.
—NOTE—
Longer drying times may be needed as temperature and humidity
vary.
6. Urethane Enamel Application - If urethane primer coat is older than 48 hours, lightly sand it prior to
application of the urethane enamel. If urethane enamel requires topcoating more than 48 hours after
application, lightly sand it before applying topcoat.
TITANINE POLYURETHANE METHOD
1. Surface Preparation - After removing old finish, if any, clean surfaces to be painted with ScotchBrite
pads and water. Wipe clean with water or an appropriate solvent and clean rags. Clean exterior skins
with an alkaline cleaner, followed by Alodine 1200.
—NOTE—
In all cases, it is important to apply the coating quickly after
cleaning.
2. Prime - Thoroughly mix by volume, 4 parts primer, 1 part primer catalyst and 2 parts primer reducer.
Allow to stand for thirty minutes and then remix before use.
3. Polyurethane Enamel - Thoroughly mix by volume, l part enamel catalyst, l/2 part enamel reducer
(except when using a flat black; then increase enamel reducer to 2 parts), and 4 parts urethane enamel.
Allow to stand for 15 minutes then remix before use.
Thin as required with enamel reducer. Recommended viscosity is 38 to 40 seconds using a # l
Zahn Cup.
4. Refinish - Installation of pressure-sensitive decals, placards, and tapes on Titanine Polyurethane finish.
A ffix all pressure-sensitive decals, placards, and tapes after the application of the finish
coating. Install the pressure-sensitive item between four and seven hours after the application of the
final coating. When possible, install the pressure-sensitive item during the 5th or 6th hours after the
final coating.
AMERON METHOD
1. Clean the surface to be coated before chemical conversion treatment and priming.
—NOTE—
For best results, apply the epoxy primer to wash primed or
Alodined surfaces.
When wash primer is used, it must be overcoated with epoxy
primer.
2. Mix zinc chromate wash primer to manufacturer’s directions. The application should result in a
smooth gloss continuous film. Allow to dry 30-45 minutes at 75° F.
20 - 25 - 00
Page - 20 - 20
Reissued: August 1, 1986
1E23
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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