Headliner fix

Chip Beaman
 

A 1982 Maramu in low humidity area, headliner sagging.  The fix, cover the inside cabin overhead along with the sagging headliner with painted plywood. 
It looks nice, but my question is-
 
If the boat goes to an area with higher humidity, would mold be a concern between the plywood, old headliner and cabin top????
 
I think it would be, but I don’t know that for fact.  If you have any experience with this please pipe in. 
 
Thank you
Chip Beaman
Future Amel Owner 

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