I fully agree with most of what Mike has to say, certainly about components, and methodology but I would add that when it comes to color preservers, I have to use them sometimes on bamboo because of the nature of the thread (i.e. Jaspers to be specific). conventional color preservers do exactly what Mike has said, they will prevent a good bond to the rod of the wrap. Most of the conventional color preservers are water based and anything that is water based will not lock the threads to the rod. Too, while they protect the colors somewhat, the colors will typically darken a little from their actual starting color. However, you probably have, and just don't know it, one of the finest color preservers already on your tying bench. The best I have found is clear gloss lacquer! It penetrates the thread and sets up a really good bond to the rod blank and keeps the color as close to natural as is possible. Most any of the non-water based head cements work very very well for that. Just thin them enough to get smooth even coverage, and with the lacquer, 2 coats usually does it. NEVER put the lacquer on over a varnish though....gator city!!
I don't wrap many of the single foot guides but when I do, they are locked with Forhan's method, it works and works well and the best thing about it is that it gives a nice epoxy lock in front of the single guide foot.
Also, I don't use single edged or double edged razor blades. I found the matt cutting blades that are used in picture frame shops are the absolute best thing out there for cutting and they outlast single or double edged razor blades 10 to one. there are two types of them. One is sharpened on both sides of the blade but the one that does best is actually sharpened on only one side. The ones you can by at Hobby Lobby are double edged and they work well. I get mine from my sister that owns a framing shop in ET. You can also find them on eBay from time to time.
Couldn't agree more about burnishing and singing the wraps, to prevent boo-boo's. I used to use one of the burnishers sold by most of the vendors but I wrap a lot of silk and I need a reduced amount of friction when burnishing. I found a piece of petrified wood at the flea market that is very highly polished and it is the best burnishing tool I have used. Burnishing, tightens wraps, and smooths the thread out prior to finishing, just be cautious around guide feet, too much pressure can cut the wrap.