On 14/02/2019 15:43, Martin Brown wrote:
On 14/02/2019 13:14, pete wrote:
replying to AL_n, pete wrote:
used the gutter sealant a couple of times. Lasts 8 months or so then
seems to get brittle and fail again.

One solution that works reasonably well is a patch of butyl rubber pond
liner attached to the inside after careful cleaning and drying with a
good layer of the most aggressive high tack rubber glue you can find.

Needs some overlap onto sound material to stop the crack from propagating.

What's the thinking about drilling a hole at each end of the crack to
stop propagation? Works with bronze cymbals!

Nick