Working on Takom Bergepanther D and the interior is to be painted in primer red. I want to apply selective filters to different parts of the interior and was wondering what color(s) to use for the filters.

there are a couple of specific red primer filters in the Wilder range. NL15 and 16.

I'm not sure it one really needs to bother with filters for the relatively small areas of an interior, but to highlight details as per washes I'd recommend green on the red. An artists' colour wheel will give you much insight into complimentary colours, etc.

I'd just do a Sepia on the hull bottom and maybe a brick|red wine red for highlights depends alot on the Paint brand your gonna use. AK is too purple tint Ammo tend to run more orange tint MRpaint is a good match out of the bottle but the paint. Or Mission models have a good red primer.

I used to have a lot of Wilder products but a few of the filter bottles gummed up on me and was like rubber as the solvent separated. I got one replacement bottle but the second time (and third time) it happened I was ignored when I contacted them (multiple times)...Sold all my Wilder stuff on ebay...