For general services most shops will just blow a coat of electrical finnish on a winding unless you specifficaly ask for a hot dip.
If lets say you have large pumps like what town water works uses to lift watse water these will generaly get a hot dip if they've been flooded and are in for a clean up and service. Windings that have been soaked get a bake an oven to dry and often the escaping steam will do some damage that only a good dip and bake will correct. AN old weathered machine thats been sitting and has moister issues might be ok with just a dry in the oven and a spray of electrical finnish it all depends.
The bennifit of taking a new ST head and dipping it depends on how well it was varnished in the first place. The whole point of varnish is to seal the winding from dirt and moister and prevent the wiring from wigging in the slots. If you have something like an ST head that you can clearly spread the turn of a coil with you thumb nail. I would sugest you ask a shop to warm it up in the oven and do a dip and bake. The heat helps draw the varnish deep into the coils, the bake even with a spray/brush on air dry product help toughen the finnish.
If you have a good winding in your head, and it obviously well bonded together with varnish then just a spary of electrical finnish is all you realy need to cover up and seal it in the event that something was scuffed or damaged inthe assembly/disaaembly of the head.
It might be the shop you were at was not an actual winding shop,some places now mostly sell motors and pumps. If they get a big job that needs a winding they may farm it out or use an epoxy resin instead of the traditional tank of varnish and oven. Ive used the epoxy too, its basical the same as the stuff for fixing fiber glass boats.
Finding people who actualy wind motors these days is rare. Its labour intensive and hard to compete with new motors made on machines or off shore by Chinese.
If you can get a hot dip and its bothering you this will work fairly well....
Get the winding as clean as possible with an industrial degreaser like Perc. Air dry it out good for a few days in a warn low humidity room. Moisten the winding with Xylene and spary on several light coats of electrical finnish. Cover with a sheet poly film to keep the solvents from drying too quickly so they have time to work and penetrate the windings for 2-4 hours. Uncover and spary several more light coats waiting for the finnish to tack nice and you'll be a certan as you can you have good penetration and coverage of the winding.
WARNING:
Perc and Xylene are solvents that can cause brain damage, ruin your liver, cause cancer. They penetrate skin and should only be used in with gloves and a organic filter cartrage resperator.
I used a lot this stuff and my health suffered. One of the reasons, I left trade my doctor said it was killing me.
Doug
