Here's a trick for hiding the repair- - - -a piece of 40 grit sandpaper pressed into the patch material just before it cures fully will give it a surface roughness almost identical to cast iron. Once the block is painted, the repair almost disappears.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!