Answer
about 30 gallons
Work Step by Step
S=$\pi$(14)$^2$+28$\pi$(30)+2$\pi$(14)$^2$
S=1428$\pi$$\approx$4,486.2
4486.2 ft$^2$$\div$300 ft$^2$/gal$\approx$15 gal
15 gal $\times$ 2 coats=30 gal
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