I'm looking for motor winding varnish in a small quantity for a repair job on a power tool motor but nothing is available locally, can I use a substitute like epoxy resin or a more easy to find varnish ?

If I have to buy a full can of insulating varnish I will never use it.

 

Is this a rotor or stator?
What is the nature of the damage repair?

 

This stator is good but the wrapping on the exposed ends of the windings has crumbled with age , my view is that it was wrapped by Makita for a reason so I should replace it because I have all the time I want to do this job properly.

 

You could let it soak in winding varnish, and when completely drained, give it a short bake in an oven of some kind.

 

One important consideration is disrupting the balance of the rotor. So you need to be careful about even application. There is also "electrical insulating varnish that I have seen in one or 2 oz bottles, used for just such repairs, and to prevent corona discharge in high voltage circuits.

 

Flooring varnish should work well. It is available in small cans, is easy to find, and it is inexpensive. I used this brand (above) with successes on power transformers.

 

Consider that the reason to tape armature windings is to hold them in place because they are not wound tight, it will take quite a bit of varnish to do an adequate holding job. So IF the smallest can is found, a lot of it would be used. But a whole quart can will indeed be way to much.
There is a product called "GLYPTOL" that is available in smaller bottles, and it should work.

 

Consider that the reason to tape armature windings is to hold them in place because they are not wound tight, it will take quite a bit of varnish to do an adequate holding job. So IF the smallest can is found, a lot of it would be used. But a whole quart can will indeed be way to much.
There is a product called "GLYPTOL" that is available in smaller bottles, and it should work.

I got the impression it is the stator that the OP is worried about !!?

 

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Flooring varnish should work well. It is available in small cans, is easy to find, and it is inexpensive. I used this brand (above) with successes on power transformers.

Sounds great for me because I have a few tins of it on my shelf.

 

Clear fingernail polish. I am also seeing plenty of 2 oz and 4 oz bottles online with a Google of "insulating varnish". I like the GC brand but there is plenty to choose from. Amazon among others have it.

Ron