Making silicone rubber chimneys IS an easy task! When I was at Alpha/Power
I learned the "secret"!
This is quoted from a posting I did back in March on the Amps reflector.
(deja vu all over again)
>The "glue" is silicone RTV and the "secret" is to clamp the joint
>very tightly for 24 hours. Use strips of plastic or metal on both the
>front and back of the joint and then clamp it with those giant spring-loaded
>clamps. Make a mark on the piece corresponding to the circumference
>and overlap the piece for at least a 1/2 inch.
So the secret (if there is one) is to make the RTV as thin as possible by
clamping pressure and also have a "decent" overlap. Not too tricky.
73--John W0UN
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