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· In a little over my head
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Discussion Starter · #1 ·
I'm about to install hardboard (Masonite) siding on an addition to my house. It's 12" wide, installed with about a 8.5 inch exposure to match esisting 1x10s. I've been advised to prime the backsides of the boards before installation for longer life.

Do I need to use exterior primer, or would this be a good way to use up some partial cans of paint that are leftover from other projects?

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