Hi Frans, Rick and all who responded:
This is very reassuring and I will probably use an exterior wall paint of matching color. That is what IZ0FYS has done in Italy. His QRZ.com page shows photos.
Frans, if I use a primer spray with <50% acetone, do you think it would soften the ABS plastic?
The black cover is a supporting part of the structure and I would not want to weaken it.
73
Alan DH2AS (G4HEQ)