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The main problem isn't a paint or an enamel but thinners that are used there. Not always these can work properly and react one with the other.
For most filters these artistic colours are used. As a thinner it is used the White Spirit or the one for lighters. Of course there are offered filters ( MIG's ones e.g. ) and these can be used as well. Washes aren't filters and applying of them causes a different effect. Filters should be applied on matt surface but washes on or gloss or semi-matt one. Check on the link....
Missing-lynx.com - Rarities World - The Filter
Ah, so that's what a filter is! I've been doing it for over 30 years, as a natural extension of art techniques used in painting pictures - didn't know it had a fancy name!
30 Years!!!! Wow. I feel like a babe in the woods with my modeling experience.
Yep I think some NEO hi-tech modelling guru came up with this filter name.
Oh sorry I had to get you wrong. But you are right.. filters aren't used on aircraft models often. These are used for vehicles mostly.
That's just the period applying artistic techniques to models. Actual modelling has been since I was 8 years old - which is approaching 54 years. Heck, I'm getting old!
As regards to your age, I am sure you are aging gracefully.