Here's a closeup. I don't have a clue on this. The spot is approx. 1 inch in diameter and is below being flush with the Gelcoat surface approx. .025" and appears to be hard as a rock when probed. The brass keel guard is not compromised or damaged and appears to be bedded in 5200. I'm at a loss on this one! The boat has been to Lake powell once and Bellingham and the San Juans twice, so it's not like it's been in the water constantly. HELP!

Here's a closeup. I don't have a clue on this. The spot is approx. 1 inch in diameter and is below being flush with the Gelcoat surface approx. .025" and appears to be hard as a rock when probed. The brass keel guard is not compromised or damaged and appears to be bedded in 5200. I'm at a loss on
this one! The boat has been to Lake powell once and Bellingham and the San Juans twice, so it's not like it's been in the water constantly. HELP!