6. Trim and lettering may be applied within 48 hours. If later than 48 hours, sand, rinse and dry before
application.
7. Rework should not be attempted before 16 hours of curing. Sand area with #400 wet sandpaper, rinse
and dry. Follow step 5.
8. For repainting, all previous old coatings (if they are not Ranthane coats) must be removed. Wa s h
surface with commercial aircraft cleaning compounds, then rinse with water. Wipe with MEK or
acetone. Apply Randolph Rand-O-Prep. Flush with water and dry. Wipe with MEK or Acetone. Repeat
steps 3, 4, 5, and 6. Allow finish to cure for one week before compounding if this is desired.
—WARNING—
Avoid prolonged skin contact and use only in a well ventilated
area, avoid inhalation of the overspray. Solvents are flammable.
—NOTE—
Do not leave mixed material in spray equipment. Clean all
equipment the same day, wash with MEK.
9. Before refinishing areas previously covered with Ranthane, thoroughly wash area. If stripping is
necessary (for inspection), use Rand-O-Strip B-5000. If the surface has been stripped, prime with
Ranthane Primer according to step 3 and 4.
10. If previous coat hasn’t been stripped or removed, thoroughly wash and then wet sand previous coating
with 380 or 400 wet sanding paper. Wash, dry, and repaint according to step 5.
ALUMIGRIP METHOD
l . Zinc Chromate Wash Primer - Thoroughly mix one part each (by volume) of zinc chromate wash
primer and acid reducer. If blushing is encountered during application, add one part (by volume) of
retarder to the previous solution.
2. Urethane Primer - Thoroughly mix two parts (by volume) urethane primer and one part (by volume)
primer catalyst. Then as required with urethane thinner. The recommended viscosity is 18 to 20
seconds using a number 2 Zahn Cup.
—NOTE—
If cratering is encountered during application, anti-crater
solution may be added to the primer solution (not to exceed one
ounce per gallon of catalyzed, thinned primer solution).
Allow catalyzed primer to stand for a minimum of thirty minutes before application.
3. Urethane Enamel - Thoroughly mix equal parts (by volume) of urethane enamel and enamel catalyst.
Thin as required with enamel thinner. Recommended viscosity is l8 to 22 seconds using a #2 Zahn
Cup.
For cratering refer to NOTE in previous step.
Allow catalyzed enamel to stand for thirty minutes minimum prior to application.
4. Surface Preparation - After removing old finish, if any, clean areas to be painted with ScotchBrite pads
and water. Follow this by wiping clean with water or an appropriate solvent. Prior to application of
primer wipe areas with MEK and clean rags.
20 - 25 - 00
Page - 20 - 19
Reissued: August 1, 1986
1E22
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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