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Preparation is Important
Wash every surface you need to cover with warm soap and water. Scrub all the impurities off with a sponge to reduce the oily residue left on the glass from handling it with your bare hands. A nice, clean surface is going to provide a better seal with whatever type of coverage you decide to use.
Liquid Mask
Apply the liquid mask using a small paintbrush. Dab a little on the end of the brush, then cover the entirety of the glass with short strokes. Take care not to brush it too thin, as this will set you up for a leakage disaster. Once you've covered the glass with a single coat of the mask, allow it time enough to completely dry out. Wait for 24 hours, then apply a second coat to ensure a proper seal.
Paper Tape
Some RC companies produce paper tape; for example, Tamiya offers yellow paper tape in sizes ranging from 6 to 40mm in thickness. Utilize this tape to cover up large curvy windows and to prevent leakage during specialty paint designs. Cut it with scissors to prevent jagged edges, as these will not stick well and could result in significant leakage during the painting process. Wash the glass with warm soap and water to ensure a proper seal.
Painter's Tape
Cut small sections of the tape to fit them inside the smaller crevices. Place the tiny pieces around the border of the windows, paying close attention to how well they stick. Make sure each section is pressed firmly before moving onto the next, and remember that there's no such thing as too much overlap. Once you've covered the border sufficiently, place larger sections of tape to cover wider spaces of exposed glass. Stick on large pieces to seal the smaller sections underneath; doing this will ensure a leak-proof seal.