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 5) Prepare the clad penetrating solution as follows:
 a)  Mix 200 grams of Potassium Nitrate (KNO3) and 100 grams of Sodium Hydroxide (NaOH) with sufficient water to make one liter of clad penetrating solution.
 WARNING: DO NOT GET CLAD PENETRATING SOLUTION IN YOUR EYES, ON
_______ YOUR SKIN, OR ON YOUR CLOTHES. IF YOU GET CLAD PENETRATING SOLUTION IN YOUR EYES, IMMEDIATELY FLUSH YOUR EYES WITH WATER. IF YOU GET CLAD PENETRATING SOLUTION ON YOUR SKIN, IMMEDIATELY FLUSH YOUR SKIN WITH WATER. MAKE SURE YOU PUT ON SPLASH GOGGLES OR A FACE SHIELD. MAKE SURE YOU PUT ON CHEMICAL RESISTANT GLOVES WHEN YOU APPLY THE CLAD PENETRATING SOLUTION.
 CAUTION: MAKE SURE YOU PUT THE CLAD PENETRATING SOLUTION ONLY
_______ ON THE SCRATCH. THE SOLUTION WILL CAUSE DAMAGE TO THE SURFACE WHERE IT IS APPLIED.
 6)  Apply one drop of clad penetrating solution with the point of a toothpick to the deepest part of the scratch.
 NOTE: Use the minimum quantity of the clad penetrating
____ solution necessary to flow to the bottom of the scratch.
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 7)  If there is a positive reaction, immediately flush the scratch with water. Do not let the clad penetrating solution stay on the scratch for more than 3 minutes.
 NOTE: If the bottom of the scratch becomes black, then
____ the scratch penetrated the clad to the base metal.
 WARNING:_______ONLY ADD ACID TO WATER. NEVER ADD WATER TO ACID OR A VIOLENT REACTION MAY OCCUR.
 WARNING: DO NOT GET NITRIC ACID IN YOUR EYES, ON YOUR SKIN, OR
_______ ON YOUR CLOTHES. IF NITRIC ACID GETS IN YOUR EYES, IMMEDIATELY FLUSH YOUR EYES WITH WATER. IF NITRIC ACID GETS ON YOUR SKIN, IMMEDIATELY FLUSH YOUR SKIN WITH WATER. MAKE SURE YOU WEAR SPLASH GOGGLES OR A FACE SHIELD. MAKE SURE YOU PUT ON A RESPIRATOR AND ACID RESISTANT GOLVES WHEN YOU PREPARE THE NITRIC ACID SOLUTION.
 8) Prepare the nitric acid solution as follows: a) Mix one volume of nitric acid (40 or 42° Be) with two to three volumes of water.
 WARNING: DO NOT GET NITRIC ACID IN YOUR EYES, ON YOUR SKIN, OR
_______ ON YOUR CLOTHES. IF NITRIC ACID GETS IN YOUR EYES, IMMEDIATELY FLUSH YOUR EYES WITH WATER. IF NITRIC ACID GETS ON YOUR SKIN, IMMEDIATELY FLUSH YOUR SKIN WITH WATER. MAKE SURE YOU WEAR SPLASH GOGGLES OR A FACE SHIELD. MAKE SURE YOU PUT ON ACID RESISTANT GOLVES AND A RESPIRATOR WHEN YOU APPLY THE NITRIC ACID SOLUTION.
 9)  Apply one drop of the nitric acid solution to the scratch.
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 10) Let the nitric acid solution stay on the scratch for one-half to one minute.
 11) Flush the scratch with clean water.
 WARNING: DO NOT GET CHEMICAL CONVERSION COATING IN YOUR MOUTH,
_______ IN YOUR EYES, ON YOUR SKIN, OR ON YOUR CLOTHES. IMMEDIATELY FLUSH CHEMICAL CONVERSION COATING FROM YOUR SKIN. IF CHEMICAL CONVERSION COATING GETS IN YOUR EYES, IMMEDIATELY FLUSH YOUR EYES WITH WATER FOLLOWED BY AN EYE WASH OF BORIC ACID SOLUTION. MAKE SURE YOU PUT ON SPLASH GOGGLES OR A FACE SHIELD WHEN YOU APPLY THE CHEMICAL CONVERSION COATING. MAKE SURE YOU PUT ON A RESPIRATOR AND PROTECTIVE GLOVES WHEN YOU APPLY THE CHEMICAL CONVERSION COATING. KEEP THE CHEMICAL CONVERSION COATING AWAY FROM SPARKS, FLAME, AND HEAT. CHEMICAL CONVERSION COATING IS POISONOUS AND FLAMMABLE AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 12) Apply Alodine 1000 to the scratch with a swab, cloth, or sponge (AMM 51-21-04/701).
If the scratch penetrated the clad aluminum, do PROCEDURE III.
Do the procedure to Clean the External Surfaces of the Airplane
 to clean around the scratch.
If the surface is badly scratched, rub it with fine or
 ultrafine Scotch-Brite pads to make it smoother.
Polish with the air-driven sander/polisher as follows:
 NOTE: Polish the airplane surface first with Schaffner
____ No. 521 white bar compound. Polish with the Schaffner No. 521 white bar compound until all of the gray undercast is removed. Then apply the No. 4094 green coloring bar compound.
　
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