To prime lashes or not to prime? That is a question I have tried and tested over the years and I always end up having a love hate relationship with most lash primers.
I have to be honest I haven't actually used one in over a year and when I ordered my Naked Palette from Sephora.com I got it as a free sample and I was hesitant at first but now my opinion has changed.DiorShow Maximizer Lash Plumping Serum & Primer

"What it is:
Dior's first lash primer that combs, curls, and coats each lash to create a smooth, even mascara base, while acting as a nourishing serum treatment that promotes long-term lash growth, strength, and vitality.
What it does:
The newest addition to the family of legendary Diorshow Mascaras, DiorShow Maximizer Lash Plumping Serum & Primer instantly primes, plumps, and lengthens lashes with an ultra-light and quick-drying formula. The first "active serum" mascara primer also contains a unique cell-conditioning complex made up of hydrolyzed soy proteins that promote long-term lash growth, strength, and vitality."
That was a way better description then I could have thought of myself so I borrowed it from Sephora.com
I received the 4ml tube and I am sad to say I am running quite low =(
*This formula does not make lashes feel hard or clumpy like I have found with other primers.
*The no clump brush glides on easy for an even coverage.
This does dry fairly quick so I only prime one eye at a time then follow with mascara before it dries. I don't know if it is best to let it dry or not but I feel it looks better with mascara right after the primer.
I have been trying to take a before and after picture all week but I am not photogenic and I have not been able to come up with a good close up of my lashes.. hopefully I will get one soon because I think the results are great.
I honestly think this product does pretty much what it says and if I was rich I would continuously purchase this.... but I am not. So I will not be buying the $28.00 regular size of this product =/ I just cannot justify the $$ on that but it is really a good product!! It probably would last a decent amount of time but I am not sure if it follows the mascara rule and throwing it out after a few months.

I actually returned this product to Sephora. I use Dior Iconic mascara and I thought that paired with this lash plumping serum it would be the ultimate combo. The first time I used this I used it before I went to bed as it says to use at night and in the morning before mascara application. I went to sleep and felt like I was wearing mascara to bed-- it was so uncomfortable. So I thought okay well I won't wear it before bed but lets see what it's like under my mascara. It was easy to apply but then I applied my mascara and it got lumpy and clumpy. The results were much better with just my mascara. I think this product might be useful if you use a different mascara. Overall, this product did not emphasize my lashes any more then using mascara alone. So I returned it. It is also very expensive.