So like anyone else with a 3D printer I have made up a few different vases since getting my Robo3D but found that no matter my layer height or number of perimeters a vase made of PLA will always wick water. So I was out on a mission... a very very short lived mission. I had some water-based polyurethane laying around (what you would typically use to seal wood). I poured some into the vase and rotated it to get even coverage, poured out the excess and let it dry. Well I can now fill a pla vase with water and have no water wick out of it. Furthermore I have even "washed" the vase using dish soap (just some soap and warm water) as a test to see if that would render the polyurethane useless but to my satisfaction it does not seem to have affected it. If polyurethane didn't work my next try was going to be a 2 part epoxy resin which I would think would work and probably provide a more "protective" seal.