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A gallon of paint covers about 300 square feet at a usual thickness of one coat; your example of 0.1 cm thick is very thick coat, equivalent to about 6 coats of paint at least; you could cover about 300/6 =50 square feet at that thickness.
2.81 gallons for every 1/100 of an inch thick. Most paints are applied at 4 mils wet, so they usually cover about 400 square foot per gallon. So you'd need about a gallon and a quart to cover 450 square feet.
A gallon of paint will cover about 300 square feetof wall area. So it will depend on the surface you are painting but in general square 5 gallons will cover approximately 1500square feet. Some manufacturers stretch ... If you can't decide between 4 or 5 gallons, go with 5 and buy it in a 5-gallon container. It should actually be cheaper than three 1-gallon cans, and you're guaranteed the colors will be the same.
"thick paint" is very vague. what is thick to YOU may not be thick to me. It depends on the type of paint, ( latex, alkyd, enamel etc,) -it's actual viscosity, how you apply it ( brush, roller, spray etc ) and finally the smoothness of the surface. 5 gal could cover anything from 500 to 2,000 square feet. - An average household latex applied to a smooth surface with a roller will cover about 300 sq.ft. per gallon.
Normally you shouldn't paint below 50 degrees, but with epoxy its more 'thick' and usually takes longer to fully cure/dry so it should be good till 40 degrees or so.