Wendelspanswick
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I never bother with acetone or other degreasers unless it's its an old engine casting or similar. The alloy sheet and extrusions I use are grease free so what are you removing with acetone?Looks like contamination. After cutting the segments you need to clean inside the tube and out, remove all the swarf, brush with a stainless brush, then acetone. It took me a while to realise clean meant really clean. Perhaps fewer segments, wider cuts, fewer welds?