I'm going to repeat it again for a lot of ones that don't read through everything. Although Masonite is a brand name, everyone associates the word "masonite" with the smooth brown slick hardboard, that most pegboard is made out of. This IS NOT the same as what OSB is, or what I am assuming Smartside is. The masonite I know, and that many are familiar with, the pegboard stuff, was used years back to make a lap siding product. This type of siding delaminated very easily, absorbed moisture, and you would see houses and mainly garages with the bottom piece rotted off and mushrooms growing out of the next couple of pieces. Now I am not sure 100% what Smartside is, hence the reason for this thread, but when my parents bought a shed kit from Lowes, I am fairly certain it had Smartside on it. It was an OSB product, stamped on one side to look exactly like wood grain.
To the ones that actually have "Smartside"......am I right or wrong on what Smartside is?
And if that's what it is, I don't think I'll have a problem is it comes pre-primed completely. As long as the edges are completely sealed, I think it will be an okay product. Like I said, in 30 years or so, I won't give a **** anyhow. I know I don't want a 4x8 sheet product though, I want a lap product. And I'm not above going with cedar, if necessary, but if Smartside does what it says, and they stand behind the product, I won't have a problem. If it is a compressed paper product like what I call masonite, hardboard, pegboard type of material, then I want nothing to do with it. I may hit the lumber company on the way home, and get a sample piece myself.
I have all kinds of time to decide because I can't get a goddamm quote from a contractor YET!!!!!!!!!!![]()
Your understanding is correct in every way. Smartside is an advanced OSB product. It is not a Masonite type product.

