What a nice wooden biplane!
Thanks for answering my question regarding the primer, I have overlooked the picture before.
I asked because there used to be a special resin primer from Gunze, but I haven't found it anywhere. If it works as well on resin as the Metal Primer from this company does on metal parts, then I would have liked to test it.
Masking on resin can be risky if the primer does not adhere well enough.
Cheers,
Frank