Thanks Tom
I considered the exact same thing but had no clue if grinding slots would weaken the casting enough to crack. And I had to remove the paint/filler in the troughs anyway, so at that point I decided it would be best to just redo the entire area and create a slope. But going that route took more hours than I care to admit. Then there is the cost... lots of epoxy... paint matching and putting it into spray cans... and a more expensive two part clear coat that comes in a single can. But I'm anal... and considering I thought it was fun, also sick.