I’ve lost track of how many times I’ve sanded the backdrop now. There is at least one more time in my future as the velour mini roller, which the manufacturer describes as follows
100% wool velour extreme short nap rollers provide a very smooth finish and are virtually lint-free. Velour has excellent loading and uploading characteristics.
let me down. While it is smoother than previous attempts with a 5 mm nap roller, it still doesn’t look like the sky. I should have ignored the guy at the paint store and gone with the foam roller as Andrew suggested.