Hi Kenaz
LOL! I was going to suggest the opposite... so I still will!
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A dusting with dark grey pastels might also help pull things around. Just another safe and easy way to avoid a repaint.
Just to add a bit more detail to the original colour question. According to the original documents quoted in Michael Ullmann's Luftwaffe Colours 1935-45, RLM 66 had certainly replaced RLM 02 as the overall cockpit colour in 1941. Prior to this, cockpits could be painted with RLM 01 (SIlber) or 02 (Grau), with only the instrument panel painted RLM 66 (Schwartzgrau).
L.Dv521/1 of 1941 stated:
"... the interior walls of glazed cockpits and canopies will be protected against dazzle with shade 66."
As regards the wheel wells etc. - Holdfast's right, RLM 02 was the official colour for such interiors, but the worsening war situation dictated radical changes, both to save materials and speed up production. A document dated 18th May 1942, specifically noting the Fw 190 calls for the cessation of painting of areas not exposed to airflow. i.e. wheel wells, interior of flaps and access panels etc.
The use of bare metal on Luftwaffe types is often thought to be a symptom of the final crisis of 1944-45, but such documents indicate that the change-over occurred much earlier.
All the best
Rowan