Never strip a SVT bolt of it's blue finish. By late 1941 Tula was bluing their bolts. War time blue looks like a cherry red while post war is purple.
I only collect war time Russian weapons but I do not believe in messing with a post war refurbished rifle. Why do it? Even if you polish the bolt and strip the shellac off you still have a refurbished rifle. And by doing so your rifle does not look factory original. But now it has been messed with and has zero collectors value. And there are still those who collect refurbished rifles. Just except it for what it is, leave it alone, enjoy it and find a factory original rifle.