I have used most matt varnish( including Winsor & Newton - Acrylic Matt varnish) over many years (30)and they have all gone yellow ( stick out over white areas) after time.
What to do? under general is a example(Humbrol matt varnish)
I gave up using matt varnish and only use GW varnish spray (Hiss
. GW has failed some times due to low temperature, bad mix, or first spray eg too thick, but i have learned to have some white spirits around for these problem.
It does have a sheen to it but goes after 6 months to a matt and has never gone yellow in 15 years
maybe i am using the wrong method to put on the matt varnish? i only ever used up to 2/3 of the pots , mixed well and did not put it on too thick?
but i am happy now with the varnish i use (if only i could buy it cheeper
) and that is the important thing, knowing it wont yellow in 5 years after all that hard work.
If there was a perfect matt varnish i would use it, still looking