The bubbles occured on the underside of the flap. That is an area
which possibly would only be exposed to tensional forces. In that
situation the bond to the underlying foam is of a lesser importance
than a continuous distribution of loads over the fibres. With
the sanding-technique those continuous fibres would be cut.
And - who says that with the heat the epoxy doesn't become soft
enuff to bond to the foam ?
But I agree that an examiner might not like the idea of reheated
areas (depending on size).
I religiously returned to all layups after approx. 3 hours to
re-stipple all bubble-areas. Saves trouble later.
Sincerely,
<Thomas, N81EU>
-----Ursprngliche Nachricht-----
Gesendet am: Donnerstag, 24. Februar 2000 14:50
An: Keith Tallent
Betreff: Re: Advice please
Trying to heat the layup and flatten out the bubbles is not a good idea -
you need a bond with the foam underneath and you wont get it this way. You
will also probably risk deforming/ debonding the rest of the layup.
The safest way is to sand away the bubbles an do a repair layup over the
resulting damaged area ensuring you get a good bond to the foam underneath
(micro filler etc). Injecting resin into the bubbles is acceptable provided
they are comparatively small.
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