Originally Posted by
Epic_Dragon
Sand the flaking clear, sand thr whole panel. Wet rub sanding is my favourite. Even if rubs through to bare metal, that is perfectly fine, have a can of etch primer on hand to spot spray over those bits. You can start with 400 grit and finish with 800 grit sand paper, splash it in a bucket of water to wet the sand paper and wet rub. Then dip it in the water often as it keeps the sand paper clean and prolongs use of each sheet. Have a small sponge in the bucket too for wiping off what we call lollie water. It's the chalk like stains left behind from wet rub. Don't let those dry on the panel as it clogs panel pores and stains and causes adhere issues. So keep it clean as you go. Put something on the floor under the panel during this process if you don't want floor to stain :)
The pin stripes if you have a rubber wheel for a drill, thst will get the pin stripe off. Go gently as the heat of the rubber can easily melt the paint as the old acrylic paint on the old cars is sensitive to heat and can melt. (More sanding if it happens) other options is sanding it down but this takes ages and can leave a raised area.