Review on Sargent Art 90 3016 20X30 Inch Canvas by Denise Davis

I bought this canvas board for oil painting. There was either clear glue or some other clear material splattered on the canvas, which floated up after my underpainting dried. I've tried spot cleaning and scraping but it didn't work. The canvas could not be returned nor used. I will never buy Sargent art plaques again. I bought two in one order, the other had small stains as well, I sanded and primed the canvas now that I know what can go wrong. Hopefully it won't do the same. The size I desperately wanted was only available from Sargent Art.