Today I came across the best tip. I was just about to toss my “empty” Urban Decay Primer Potion when I saw this blog post from the blog Clumps of Mascara. Aparently if you cut open the tube there is a tonne more product than you can reach with the wand. I depotted my “empty” tube and found almost a full 10 gram jars worth of potion! Check out the pics on the blog.