Never had a primer work for me, in fact they all made creasing worse than without... Finally caved and bought this. My shadow used to last 2 hours.. Now it's 10+! From 8 AM till around 6-7 PM is the soonest it's started to crease, but when I get home at 4:30 it looks exactly the same as the morning! Price doesn't really bother me as long as the product works!!!