Re: Another delamination problem

Rick Hole

I use a quarter coin held between thumb and index finger.  Tap the edge of the coin lightly and note the sound.  For orientation go outboard from the damaged area a foot or two for some test taps against solid glass-to-foam sound.  It will be noticeably duller than the sound at the center of the delamination.  Tap around that area and mark where the taps sound the same as your test taps.  The area will always be larger than the visible delam area.  If you are using the injection repair technique drill your holes at the edge of the area you have marked.  You may need more than two holes if the area is large.  When the area has been filled and epoxy flows form the opposite hole (the higher one) weigh down the delam area with something heavy to compress the fiberglass skin against the foam and push the excess epoxy out through the holes.


Note that if before flooding you should be able to push the delam fiberglass against solid foam.  If the area is mushy that indicates the foam is crushed.  In that case it is better to cut the skin where you have marked (a bit bigger is better), remove the damaged foam and build back with a contoured piece of foam of the same type, glued with epoxy mixed with micro-balloons, when cured, sand and glass on a replacement patch.  Q2 instructions have a chapter how to do this.


Use of two-part foam is not acceptable as it is not strong enough to carry the load.


If you can find an experienced fiberglass builder to advise you in person, that is your best course.


Rick Hole



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