>>6205318 (You)>>6205382 (You)I was sitting around, so I thought I'd go ahead and try the acrylic and pastel chalk combo, applying it to the underside of the turret first, since it couldn't be seen. I also used a color I wouldn't really need since I bought the pastels cheap as a set off of eBay.
I started by using an emery board but switched to scraping with a hobby knife since the emery board got clogged pretty fast and it would be a waste of a board. The resulting texture looks pretty decent but I won't be able to spray until the air outside warms up a little bit.
Not sure if it could be seen in this pic.
I forgot to mention to watch out for big chunks sliced off from scraping. It probably could be controlled better by watching how the blade is used to scrape.