Hartzell HC-D2MV20-3 Series Owner's Manual And Logbook page 193

E. Painting of Aluminum Blades
WARNING:
CAUTION:
(1) Using acetone, #700 lacquer thinner, or MEK, wipe the
surface of the blade to remove any contaminants.
(2) Feather the existing coatings away from the eroded or
repaired area with 120 to 180 grit sandpaper.
NOTE:
(3) Use acetone, #700 lacquer thinner, or MEK to wipe the
surface of the blade. Allow solvent to evaporate.
(4) Before refinishing the blades, apply a corrosion
preventive coating to the bare aluminum surface. Oakite
31, Chromicote L-25, or Alodine 1201 are approved
chemical conversion coatings. Apply these coatings in
accordance with the directions provided by the product
manufacturer.
(5) Mask the tip stripes, as applicable.
Maintenance Practices
Propeller Owner's Manual
CLEANING AGENTS (ACETONE, #700
LACQUER THINNER, AND MEK), ARE
FLAMMABLE AND TOXIC TO THE SKIN,
EYES AND RESPIRATORY TRACT. SKIN
AND EYE PROTECTION ARE REQUIRED.
AVOID PROLONGED CONTACT. USE IN
WELL VENTILATED AREA.
ANY REFINISHING PROCEDURE
CAN ALTER PROPELLER BALANCE.
PROPELLERS THAT ARE OUT OF
BALANCE MAY EXPERIENCE EXCESSIVE
VIBRATIONS WHILE IN OPERATION.
Paint erosion is typically very similar on all
blades in a propeller assembly. If one blade
has more extensive damage, e.g., in the tip
area, all the blades should be sanded in the
tip area to replicate the repair of the most
severely damaged blade tip. This practice
is essential in maintaining balance after
refinishing.
140
61-00-40
Page 6-15
Rev. 2 Jun/12