Hello fellow model builders, I've been asked to introduce myself, as a kid I often glued model kits of any kind, tanks, planes, boats, you could see the glue everywhere, no painting , decals? can't remember, anyway I'm now 60 yrs aged and rediscovered the now therapeutic hobby of model building, my interest hasn't changed, still mostly WW2 stuff, planes, ships, I have what I think is a pretty good setup, now I paint, tools, sanding supplies etc,.. as of now I've built 6 models in the past 4 yrs or so. So, my first question to anyone interested in answering is this, when the directions say to add "weight ', what's your go to?, Thanks for a reply.