Restoration Technique Questions

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"1 - If someone says "I applied descaler needles to the entire chassis surface" what does that mean?"

The descaling needler is a pneumatic air hammer type of device used in the boiler trades mostly. It is used to remove heavy scale from boiler tubes without removing good steel. I have one here somewhere but can't seem to find it to get a pic for you. It basically looks a lot like a typical air ratchet in size and length but the head portion instead of being the air ratchet design has 20 or so hardened steel wires that stick out about 4 inches or so. When you apply the air it creates a hammer type effect with the ends that removes the scale buildup by hitting it with high force in a small area. I can see it being used on frames but unless you are very good with it or use lower air pressure it can leave a surface that is far rougher than sandblasting. The boiler tubes that it is intended for are a much harder alloy than vehicle frames. Again it is intended for removing heavy scale in boilers such as carbon, ash, etc. that gets very very thick and hard.