That may be just overheated low temperature paint.. you can buy a can of high temp paint at an autoparts store, 1200* or 1500*. But, personally, I'd save the $$ and put it in a 'coal stove' fund.. you really need to get a better stove. The amount of work you have put into this 'make-do' stove allready to fix the obvious poor manufacturing practices, and now the low temp paint,, all indicate that the stove is marginal at best..
Please keep looking for a good, used, made-to-burn-anthracite stove for your home... This stove is not one that I'd like to have burning while I sleep in another room.. make sure to have several smoke detectors and CO detectors in the house.
Please have a good fireproof base under the stove, and keep at least two 5 gallon pails of sand to use as a fire extinguisher nearby. With the previous posts about the sheet metal base on your stove and legs ripping out of the base of the stove.. I really recommend a different stove.
Sorry to be so negative.. but there have been several 'red flags' raised already with this stove,, and the real heating season is still months away, and it really isn't cold yet..
Safety comes first..