Probably every master was faced with the problem of unlocking a rusted bolt and nut. To do this, two main things are needed - patience and a sense of proportion. If it is not possible to unscrew the bolt, then it is not worthwhile to exert extra effort - because this way you can break off the head and tighten the repair.
First you should try to remove rust from the thread turns with a hard metal brush. Next, choose the right tool - the best cap wrench or head (the longer the handle of the tool that unscrews the bolt, the greater the chance to unscrew it). If the part does not budge, then one of the effective lubricants of the British brand Ambersil should be used. Namely, the penetrating lubricant https://kvota-oil.com.ua/en/catalog/penetrating-oil/, which is abundantly applied to the surface of parts and left for some time to soften rust and dirt. Subsequently, unscrew.
With a negative result, there are several more options. In order not to cut the bolt or nut (which can significantly tighten the repair and increase financial costs), you should heat the part using a torch, gas soldering iron, or use https://kvota-oil.com.ua/en/catalog/rust-flash/. A ten-second threading of the agent quickly freezes rust to -40 degrees, it cracks and this allows the lubricant to penetrate into the depth of the thread and unlock the rusted bolt and nut. Unscrewing the bolt / nut is now easy.
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