Originally Posted by ultraviola
Would "reasonable" not imply the seller doing this chore themselves prior to advertising/taking photographs and then charging, say £15-20 for the set to attract more bids and increase their profit?

Ooops, sorry, I missed this.
Odds on it isn't worth his while buying paint and messing about for a few hours to perhaps gain £15, less the £10 for the Hammerite and brush. Hammerite 'aint cheap.