About the craters, my father used the same airhoses for the airtools in the shop a while back, and and we got craters in everything. I couldnt figure out why, but it turned out he sprayed silicone in the extensionhose instead of directly in the tool for lubricating it. So the tip is, use separate hoses for blasting/coating and other airtools, keep then free from any oil.
Also, when using a waterseparator on the system, place it as close to the tool as possible, most condensed water ends up in the hoses when the hot compressed air cools off in the hoses. So placing it on the compressor dont give any good result...
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