451 overheating, even when moving

Found this floating at the top of the rad when I was opening it up to drain for removal later today.
IMG_20230722_192015199.jpg

Pretty sure random chunks of RTV shouldn't be in there ;) Let alone it's not the blue stuff.

The water pump will be coming off as well today and replaced with a new one to make sure there aren't any random chunks of stuff hiding behind the impeller which may cause problems later.