[Geek44]

Whatever works is good Em. I must say that I think your white glue method is quite 'left of field' but as I said...if it works, it's good.
My experience with white glue was when I tried to use it to fill seams a long time ago. I think I ran into problems when I tried to sand it...the glue came up out of the seam in one piece and I was basically back to square one. I only use it now to reinforce small parts that have originally been attached with super glue which is very brittle. My hope is that if the CA glue lets go, the white glue might keep it in place.
With the decals and glossing over them, there's a thing to consider. Some folks (me) like to scratch up and chip decals along with the rest of the model. There are two ways to attack the decal as far as I can see. You can paint the chips on and that works fine. You can also physically damage the decal itself which I normally do on aircraft. I do this because the decal usually sits on a surface that has been scratched and chipped to reveal a natural metal undercoat. Some parts of the decal have 'shallow' scratches that are the same colour as the paint the aircraft carries...or 'deep' scratches down to the metal. The available metalizers are not designed for brush work, so I find damaging the deca works best. My point is that the decal should be scratched up before the gloss coat goes over them.