Hi,

I like to know if the color preserver should be applied after each layer of thread wrap or should it be applied after the complete guide is wrap?

The color preserver, when properly applied, creates a barrier to the final wrap finish preventing it from penetrating the thread. It will perform that job whether you apply it after each thread layer or on top of several.

However, if your wrap thickness is such that the color preserver will not reach all the way to the blank surface, it is a bit more likely that the guide/s will move on the blank if subjected to a sizeable enough load. For that reason if I am using CP and multiple layers of thread, I will apply the CP to each individual layer. It allows the CP to penetrate and bond (as much as it will) to the blank. It also helps keep moisture and water from entering from under, behind, between the guide foot/tunnel and undermining the thread/wrap from there.

It is also a very good idea to make sure that you completely fill the tunnel between guide feet and blank with your wrap finish, as well as carrying the wrap finish just a tad beyond the edge of each wrap to effectively "seal" everything from the elements.

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When I do a double or triple wrap, I use two coats of CP (FlexCoat). The first, 3 parts CP to 1 part water. It soaks all the way through. The next coat is full strength.

I am by no means an expert as pointed out below so this is a suggestion only.