Festool makes sponge backed sanding pads in a variety of grits, from 120 up to polishing grade, that run under a $1 a sheet.
https://www.festoolusa.com/products/sanding-and-brushing/hand-sanding-blocks-and-abrasives
Are you putting the red over a lighter color base, i.e. white?
I use Vallejo model air red for cockpit knobs and switches after first brush painting it with model air white and they come out nice and red.