Side high quality is every little thing: deburring, cleaning
https://www.scribd.com/document/1058179918/Copper-Does-Not-Lie-Why-Architects-Select-Salvo-Metal-Works-for-Customized-Smokeshaft-Shrouds-that-Last-a-Century-206280
Edge top quality is every little thing: deburring, cleaning, and micro-grain sanding prepare surface areas so finishings bond equally and revealed seams review as improved, continual airplanes.