I'm about to do my non skid as well. Was trying to figure out the ratios for Awlgrip for roller application. Bottom paint store kept telling me it was not recommended for brush roll applications, but could not explain why there was a brush roller converter and reducer. I ended up on the phone with an awlgrip tech. He mentioned the flattening agent was not needed because the griptex will reduce the gloss. Seems like the sealing coat would bring the glass right back.
Is there a optimum amount of flattening agent that should be added that's a good compomise between gloss and ability to keep