I had exactly the same experoence. Cut out the opening, discovered I didn't need
to then patched it up with epoxy/bid and filled and faired it. After a short
while running, the heat from the exhaust made the patch turn brown and some
blisters
appeared. I refilled the blisters and resprayed the patch then stuck some
aluminium foil over the patch inside the cowl to reflect the heat and haven't
had any further problems since.
Richard Iddon
G-RIXS
On 15 Jan 2012, at 18:55, Sidsel & Svein Johnsen wrote:
>
> 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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