Peter Twydell wrote:
In message , Phil L
writes
Peter Twydell wrote:
What's the best way to key the paint on steel panel radiators before
repainting? Sandpaper, wet or dry, flapwheel, something chemical?

None of the above.
Use steel wool and lightly rub down, especially inside the grooves


Ah, the one thing I didn't think of.

But wash it off veeeeery carefully afterwards, or tiny flecks of steel wool
will suddenly bloom into rust in the wet emulsion.