Powders and chaulks are easier to be speedy with imo... or at least "busy". There is great therepy in busy work; No deadlines except for train eh?
I find them messy overall though. I liked oil crayons/pastel, inks & paints in general for other art.
This is model railroading: The sooner you finish, the sooner you are ready to start over. Perfected or not has little to do with anything. Artists often hate their present work eventually too, You'll see.🤣 When you find an aspect you enjoy, ride the wave. That's where it's at.
Try letting the acrylic dry a bit and working it off slow with a med-stiff damp brush.
I have about 20 decent brushes. Natural and synthetics, stiff/flexi, fans, bobs, flats, tapers, 3 under 1/16" dia or long, and a big can of throw away cheapo kids water color brushes(work fast as solvent paints melt these suckers and the glue that holds bristles in and ferule on too. Heck hot water can loosen the glue after an hour or so of soaking/pulling hard while cleaning (lightly only anyhow)/etc. I'll dress them in folded paper till dry and treat natural bushes with mineral spirits or even clean mineral oil, hair conditioners then spirits until flushed. It keeps them soft and prevents split ends ) Drag a stainless hobby wire brush thru them rather than jab to clean.
Recall working your dimestore watercolor paints as a kid? Dampen, work with brush a little, maybe pat with strong tissue/sponge to grab some excess water & loose pigment, get off it for a while, let it set again.
You can use some pretty dark washes. I keep two dishes of brush water. The pre-clean water gets saved in an emtpy paint bottle unti it gets muddy dark. The final cleaning dish is dumped in the sink often. Right down the center of the drain tube so micro- scratches etc. cant grab pigment. (long term itv&'ll pay off plus save some soft scrub )
Alcohol will clump certain acrylics. It also made it cure different too. I only tried it once or twice, I only use room temp. water now.
No wind weathering, I did that as a kid along with mud spatters on model cars. Just Rouge style acid rain and rust for the trains. 😂
I just shower/pour it on, shake/work a bit off maybe, and walk away. Heavy rust in seams & corners was painted on then worked off with a brush during a few grime washes. I never put a final flat wash on the stacks; they are a bit more subdued to the eye than on camera though
Grime, dry, then drips on just the caps until it ran, dry, grime, drip, dry, drip dry, grime dry, drip, etc. bands painted then rivets worked clean with a wet toothpick (silver is an oil based aluminum) The toxic tank is a 60s-70s hard plastic Barbie(?) suitcase.
You can tell from my eXxcellent electrical tape grapics, I'm very fussy 'bout my styling 😲 😎
See, nothing great, but ok & lots of fun