please don’t use caustic soda for getting paint off, if you mix it too strong it will eat into your frame and weaken it!!, im talking from experience, i put some onza vp pedal cages into caustic soda to see if it would take the paint off, it did take patches of paint off, but it then got under the paint and corroded the aluminium , they are now about 1mm thick!!, super light lol, just use nitromorse (i think the green can is slightly better than the yellow, the yellow is for household paints like emulsion ect) and either some wire wool, or other abrasives