I used to use chaulks for artwork on paper. Scraping it off and into a pile for brushing.
A good art supply store might be a good alternative for those without a good modeling shop.
Not quite so patient or fussy anymore, I like washes and drybrushing with water based craft acrlyics. Paint, but not extremely durable, over time, touching things up with "maintance paint" or working with the new imperfections to look more "aged" is needed from daily handling.
Not on everything, but I like slowly ageing things in stages too; spred over months, with running in between. Then spruce up paint of say...just the steps and hand rails. A month later, add a grime wash layer, and after it dries, freshly paint the window frame. etc.
It's is kinda fun doing both Maintenance freshening, and ageing/weathering at the same time.
One tip, sealing coatS, plural, not 1 coat, but many mistings. Go slow, no "wet" look till its mostly sealed by "dot" accumulation from a few layers. Wetness can cause a smeary look and/or washout.