Hi Kwags, CA is strong stuff so you just need a small drop each at certain points and intervals, even if it's a large PE part that you're attaching. Just make sure that you don't have dirt, grease or even paint at the points you're putting glue on. If it's the first two "contaminants", you know the CA may not stick to the surface. If it's paint, your paint job may be literally ripped if the PE part gets knocked over, although usually only the paint at the contact point gets taken off (but I've seen worse happen).