Greame,
Further to what Bob Borger just suggested: I have done some other small
mods on my lower cowl, and discovered after some operating hours that the
bid/epoxy layups turned dark brown on the inside and the nice, white paint
turned light brown on the outside! Those at Europa Aircraft at that time
told me the reason for this: Epoxy does not stand up to heat as well as
polyester does, and the cowls are therefore made of bid/polyester.
If someone with better knowledge/better memory can confirm this, you should
use polyester with suitable bid to cover the duct inlet.
Note: There has been no separation of the epoxy-based layups from the
factory-made cowl in my case, so it is only cosmetic.
Regards,
Svein
LN-SKJ
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