hey peter64,
here is the skinny on how to apply pe. first things first though. this is how i do it... everyone in this forum probably does it a little differently and god knows my way is probably not the best.
let's start out with things you'll need:
1. ca (superglue, the better, well, the better)
2. razor blade or solid x-acto knife
3. the finest tweezers you can get your hands on.
4. a good cutting surface. i use a piece of plexi. i find that the harder the surface, the better.
5. rubbing alcohol
ok, and some things to make life easier:
1. a sewing needle
2. two sided tape (or just a piece of tape you roll up and push flat.
now that you have all of you stuff, and before you start cutting, you should know that the instructions with pe sets usuall stink. in other words, read and reread them. then read them again as you go along. secondly, since pe is flat and some parts in real life aren't, you may not want to use all of the pe parts if the ones on the kit look better.
ok, let's get started cutting. following the instructions, cut the first piece off of the sprue. lay it flat on your cutting surface and just press down on the little connector with your exacto or razor. this is where the tape comes in handy. anyone in the forum will tell you that pe has the magical ability of flight. if you cut in on tape it will usually stick... but be careful. take every precaution so that, if it does fly, you can find it. try to not get it to fly in the first place though.
now the piece should be removed from the spru, but there is probably s little piece of the sprue left. you can knick that off with the razor or your exacto pretty easily. once the piece is cut and cleaned of spru-ness, it is usually time to bend or shape in some manner. for this, use the edge of your razor or exacto for a sharp bend, or something round that matches the curve you need for a curved one. it really varies case by case, so try a bunch of stuff out.
by now it should be cut and shaped. clean the piece with the alcohol, then take your pin and dip it in a little ca and then apply the glue where you need it on the pe. this also depends a bit on the piece, just know that a little ca needs to get where it is going to meet the model, however you want to get it there.
then stuck it on the model per the instuctions and let the pe cure. when all is cured, clean it is alcohol again and prime your model. pe needs to be primed so paint will stick.
well, that's about it. when you start using it, pe is a real pain in the butt... after a while, it gets easier and less tedious, but it can totally add detail to your model you wouldn't have gotten otherwise.
~ have fun
~ g