I have been trying to find out the best ink to use for panel lines.  I searched here and on the interweb.  I am not lazy, I just looked through all 33 pages in this Paint and Finishing section.  No luck.

The Rapidograph inks I have found for film are India Ink, Ultradraw, Rapidraw, Universal, and a few others.

I am interested in Black and White colors.  It will be applied to a doped surface and top coated with clear dope.

I will be using it in Rapidograph pens that I still have from the days of yore.

Any suggestions are appreciated.

Hi

I’ve experimented with the following for panel lines on RC, FF and CL models (and a lot more different types of pens). 

The refillable Isograph allows you to mix the black/white to get a kind of silvery grey.
Needs a clear over the top.

https://www.amazon.co.uk/dp/B0007OEB1S?ref=ppx_yo2ov_dt_b_fed_asin_title
https://www.amazon.co.uk/dp/B000KZCJ4A?ref=ppx_yo2ov_dt_b_fed_asin_title
https://www.amazon.co.uk/dp/B004VQVV0M?ref=ppx_yo2ov_dt_b_fed_asin_title

I’m no expert for sure.  Some of the Brazilian guys seem to get great results which I was trying to copy.  Looks good on transparent film.  Would be good ito hear hiw they do it 😀

Indirectly related, but after trying a bunch of different pens, this is one of the best and cheapest I found for panel lines.  At least for my taste anyway.  Again, needs a clear.  See pics below.
https://www.amazon.co.uk/dp/B06XFRX1SJ?ref=ppx_yo2ov_dt_b_fed_asin_title


Lol, I tested lots of pens on pop bottles 😂

https://forums.modelflying.co.uk/index.php?/topic/43284-another-ab-canberra/&do=findComment&comment=996924

Mike, nice pictures and that is a fancy pop bottle.


I sorted through an old Windy video, and he said Rapidograph for ACETATE worked the best.

Is that what folks use?

I guess he means the same as Mylar film. But where to find it?

[quote author=Mike Quinn

PS might be a transatlantic translation thing but ACETATE in the UK nearly always refers to Acetate sheet.  The stuff you make canopies/cockpit windscreens out of.
[/quote]

 Yep, since always, there has been 2 different inks: one for paper and another for plastic drawing film. Maybe, when Windy was young, the plastic was some sort of acetate. Today it's mostly polyester (Mylar). The one for plastic film is what you want.
I have used the paper ink in emergency, it flows nicely when you add a minuscule amount of Fairy liquid. But also, as the soap kills the surface tension, it flows too nicely in the capillary channels and messes up the pen and your fingers sooner or later. The paper ink is also very very fragile before you shoot some clear over it. L