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from my trial and error.
cut the side out, give yourself a little extra.
put the cutout mat on some cardboard and use a thin foam roller to wet the matt. then place it on the side you are glassing and roll from the middle out. up, down, left and right. once it starts to cure a little you can take the tip of a brush (throw away brush) and kind of punch at any air bubbles untill they go away.
your gonna want to sand those bubbles out if lumps will bother you.
you should be able to do that whole box glass then extra coats with a gallon.
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