Priming the HS-4 tail boom stabilizers

Suomeksi

When both the fabric covered areas of the Mil Mi-8T (HS-4) helicopter tail boom stabilizers had been covered with thin 0,3 mm aluminium offset printing sheet, we could move on to priming these new aluminium surfaces. Obviously, the decayed fabric coverings were renewed with aluminium sheets instead of fabric.

Right hand side photo by Mårten Juslin.

The first phase in priming is to remove grease and dirt from the surface to be painted. KUSTOM-anti grease agent was used to remove the grease. The agent was applied to clean cloth and both stabilizers’ new aluminium surfaces were meticulously wiped with it. The anti-grease operation for other surfaces of the stabilizers will be done in conjunction with the paintwork because their surfaces are already set up for the paintwork.

Photo by Mårten Juslin.

The next step is the graining of the new aluminium surfaces to be adhesion-primed, especially as the HS-4 tail boom stabilizers’ new surfaces are smooth like a mirror.

Photo by Mårten Juslin.

The graining of the new aluminium surfaces was done with a traditional scouring pad. After graining, the graining dust was wiped off the surfaces with a clean cloth. It was noticed that more dirt had accumulated to the cloth used for wiping off the grease and dirt than to the cloth used for wiping off the graining dust. This goes to show, how important part of the priming, the removal of grease and dirt is.

Right hand side photo by Ari Aho.

As a primer or adhesive primer we chose the handy spray paint (Car System Prefill Spray Miranol) and its tone (RAL 7005). Light grey is in this case a good tone for the adhesive primer, because the stabilizers’ undersurfaces will be painted light grey (Light aircraft grey).

Photo by Mårten Juslin.

The stabilizers that were ready for priming, were taken to the painting tent at the yard of the Finnish Aviation Museum. There the primer was misted on the stabilizers’ surfaces as a thin, but engulfing veil. The stabilizers are now ready for the paintwork.

Photos by Lassi Karivalo except if otherwise separately mentioned.

Translation by Matti Liuskallio.