A question about varnish and its odd interactions with certain miniatures

[ced1106]

https://www.amazon.co.uk/Acrylicos-Vallejo-Varnish-Matte-Polyurethane/dp/B00BATAAVO/ref=asc_df_B00BATAAVO?mcid=771fff09a6643b9a9d5b4b8273615206&hvocijid=18104370573567881340-B00BATAAVO-&hvexpln=74&tag=googshopuk-21&linkCode=df0&hvadid=696285193871&hvpos=&hvnetw=g&hvrand=18104370573567881340&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1006810&hvtargid=pla-2281435177578&psc=1&gad_source=1

With Amazon, cut off anything that starts with ref.
https://www.amazon.co.uk/Acrylicos-Vallejo-Varnish-Matte-Polyurethane/dp/B00BATAAVO/

It's now in my cart (: but I've yet to varnish any of my mini's, not that they deserve it.

My own tacky experiences were from certain boardgame plastics and spray primer. I read that you sometimes can't get rid of tackiness because the upper layer dries, but the inner ones never dry? :/