Reply To: Whats the Best Way to Stop Them Going Glossy

[timchubbKeymaster 3166xp 0]

One thing i forgot to mention is that arcylic paints are a type of plastic, and are naturally satin in finish, the main difference between artists acrylics and model acrylics is that model acrylics tends to have a matting agent added to their formulation, ive got no proof for this other than anecdotal i.e. some old paint of mine dries to a different finish from how it did when it was new. But i believe that the matting agent deteriorates/reacts over time from contact with oxygen or something reactive in the atmosphere so has less of an effect than it should have, which is probably why adding matt medium fixes the issue.

One thing i have taken to doing when storing paints for a long while is to get some air tight plastic tubs like these

and storing the paints in them, i should probably spray them black as well to prevent UV ingress, but as i store them in my loft or a cupboard that minimises the risk from the sun breaking things.

https://www.amazon.co.uk/Winsor-Newton-Galeria-Acrylic-Medium/dp/B0052YTUCI/ref=sr_1_4?crid=35R1ATS0CQXKQ&dchild=1&keywords=acrylic+matt+medium&qid=1614000074&sprefix=arcylic+matt+med%2Caps%2C155&sr=8-4 thats the matt medium i use, was cheaper when i bought mine a few years ago, but still that would be a life time supply for £15