Cheap option is ol rattle can from rustoleum-grill paint
Can also pay to have powder coated. I personally will be spraying mine with cerakote 1800F air cure. If you have an HVLP gun you are looking at $100-$200 in paint. If not it could get up to $300+
Raw linseed oil is the thing nowadays. If your welds look like crap it will show painted or not. Take a grinder to them and smooth them out if you want but I say hell with it and be proud of your build stack of dimes or not
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