Exterior Paint

Hey
I just got finished painting a couple of boxes for the back of my suburban which were made from mostly 1/2" birch virnear plywood (cheap garbage wood) from Home Depot. I sanded the plywood and painted with Valspar Ultra premium exterior semi-gloss latex paint. I have used a 1/4" and 3/8" nap rollers and rolled the paint on, let the first dry and applied a second coat. The problem is the finnish comes out looking like it's textured and not smooth at all. While I don't mind it for this purpose, it would be lousy on the side of the house. Has anyone else run into this problem? Is there something wrong in my application? I wondering if it has to do with paint being so thick these days. Would oil base be better? Hand brush instead of roller? Thanks for the hlp and suggestions.
Pete Wilson
I just got finished painting a couple of boxes for the back of my suburban which were made from mostly 1/2" birch virnear plywood (cheap garbage wood) from Home Depot. I sanded the plywood and painted with Valspar Ultra premium exterior semi-gloss latex paint. I have used a 1/4" and 3/8" nap rollers and rolled the paint on, let the first dry and applied a second coat. The problem is the finnish comes out looking like it's textured and not smooth at all. While I don't mind it for this purpose, it would be lousy on the side of the house. Has anyone else run into this problem? Is there something wrong in my application? I wondering if it has to do with paint being so thick these days. Would oil base be better? Hand brush instead of roller? Thanks for the hlp and suggestions.
Pete Wilson