When you do a stain job, the first thing you must do if you want an acceptable job is to get the entire blade back to a bright, clean white. In other words you strip the entire blade of whatever is on it, whether that is rust, or whether it is part of an old , worn previous stain.
With cold blue you can spot little bits of a worn stain job, and if you're careful, you can blend the touched up spots carefully so you can't really see where the spotting has been done.
On the art of staining, a normal commercial job is done by soaking. In my opinion this usually results in a pretty lousy job. The only way to get a good job is to do each blade individually, and whether you do it with the brush on method, or the massage method you do need to have a fine understanding of climatic conditions to get a good job, and also be prepared to go back to a white blade again and again until you get it right. Experience does help, but no matter how experienced somebody is, not every blade comes out perfect every time, and with a good blade, perfection is the only acceptable result.
You can get some sort of a result under almost any conditions, even inside in the middle of winter, but for a truly good result you need a clear sky with no clouds --- clouds cause a less than brilliant, sparkling finish --- middle range humidity so that the drying time between applications is neither too long nor too short, and a temperature that is neither too hot nor too cool. In Jawa, probably early morning in the dry season is about the best time to do a stain job. Whenever you do the job, wherever you do it, the weather is vital for perfection.
Yeah, that link looks like the stuff I'm talking about. My bottle looks a bit different because I bought it a long time ago, but its probably the same stuff.
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