A nice masking tutorial with videos can be found HERE
In 2014 Tamiya released Masking Tape w/Plastic Sheeting, a handy combination of masking tape with a opaque plastic sheet attached which allows you to mask with precision, using the sheeting to cover large areas and saving time otherwise spent taping the whole area to be masked. When folded out the 10m roll has a width of 550mm.
See it in use on Resin Illuminati who posted a nice quick look at the line.
Tamiya Masking Sticker Sheets are essentially a A4 sheet of Tamiya masking tape and are ideal for various tasks such as masking off areas on R/C models, static models, and craft creations for painting. Simply plot and cut out your design, remove the backing and position the mask to the desired area and paint! The masking is easily removed and unlike most masking products it leaves no sticky residue.
TAM-87030 6mm Masking Tape
TAM-87031 10mm Masking Tape
TAM-87032 18mm Masking Tape
TAM-87033 6mm Masking Tape Refill
TAM-87034 10mm Masking Tape Refill
TAM-87035 18mm Masking Tape Refill
TAM-87063 40mm Masking Tape
TAM-87129 Masking Sticker Sheet 1mm Grid Type (5)
TAM-87130 Masking Sticker Sheet (5)
TAM-87164 550mm Masking Tape w/Plastic Sheeting
TAM-87177 Masking Tape for Curves 2mm
TAM-87178 Masking Tape for Curves 3mm
TAM-87179 Masking Tape for Curves 5mm
TAM-871184 Masking Tape for Curves 12mm