If I remember correctly, Sears Weatherbeater is approx 37% Solids. Now this was about 7 yrs ago, so it may of changed, but I do doubt that.
I've used both Sears Outdoor and Indoor paints and have had great success with them both. I've also used numerous Sherwin Williams paints and had success with them. Really the only one paint brand I have not had too much success with is Behr (home depot).
I had my alum. siding spray painted buy pro aluminium sidding painters ,Two coats SW A100 ,15 years ago. After about 12 years it became flat looking and dull. I hand washed the sidding with tsp rinsed extra good twice ( paint won't stick to residue left by TSP ) I hand painted again with SW A100. it came out great. I hope I get another 12 years .