This is the best there is! I got my first lash primer as a sample and I was hooked! It is reasonably priced as well. No clumps or gooey mess, just separates and builds lashes, light for a feather duster look and a little more for a glamorous look.
Estee Lauder Lash Primer Plus is the best product I have used for eyelashes. It comes out of the tube onto the brush very smoothly and doesn't clump. It protects your eyelashes from drying out when you apply mascara. I also use it on my eyebrows before I put brow shaper on them.
For those of us that hear "as you age" way too much. As you age your eye lashes start to thin. This product helps give your eyelashes the appearance of being thicker without looking like you used 5 layers of mascara. It looks white in the tube but goes on clear. I used to use MAC primer. They discontinued their primer that went on white. This is better you can wear it alone or under mascara