I just thought I'd add that
muzz mentioned somewhere about scraping off the excess paint from the edges of the roller as you paint to avoid roller marks. Since all of my original panels were done with 6" rollers, I didn't have many issues with roller marks.
Today I rolled a panel with a Purdy 1/4" nap roller (thanks again muzz!!
) and I can attest to the merits of getting rid of the excess paint from the edges! I was having issues until I thought to myself "muzz said something about scraping the excess from the edges" so I actually wiped it with a clean rag. I had no issues with roller marks!
Excellent advice muzz!!
mech