Catalina 30, Wing keel, Bilge question

May 30, 2016
4
Catalina 30 Traverse City, Mi
Is it normal for the bilge to form a white skin of something on top of the antifreeze after the winter layup?
 
Feb 8, 2014
1,300
Columbia 36 Muskegon
I've never seen that. What kind of antifreeze and was the bilge clean before?
 
May 30, 2016
4
Catalina 30 Traverse City, Mi
The bilge had been rinsed with a standard bilge cleaner but was far from clean. The antifreeze was 50/50
car variety (i.e. green)
 
Feb 4, 2014
4
Catalina 30 Easley
What's lighter than water and goes to the bilge? Oil, diesel - and those things can do that in small amounts without much trouble - when you say white film - that implies a different combination and you need to make sure there has been no mixing of water and petroleum within the engine itself.