Filling around flakey deck caulking

[Guest]

Hi

My black deck caulking is starting to crack letting in water.
I don't want to have to recaulk just yet. Is there a thin
solution of varnish type consistency that I can squirt
into the cracks that have opened up between the caulking
and the teak? They are minute cracks and rarely more than
1mm wide. I think a "normal" mastic would be too thick.

I guess I'm looking for a very watery type of black mastic.

Any help appreciated. Thanks.

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[MrFish]

I've not come across anything that would fit your needs.
My calking was still flexable when it started being 'rolled' out of the groove in the teak by peoples feet.
I've successfully "patched" the heavily trafficed areas which need doing urgently by doing the following.
Raked out the more or less loose stuff with a 1/8" chisel
Cleaned the sides of the groove especially carefully
Washed (de greased) the teak in the groove with the Sika (brand name) thinners
Put the thin tape in the bottom of the groove (allows the calking to move with the teak)
Masked either side of each groove with masking tape
Filled the groove with the Sika calking compound from a cartridge gun
Faired it off with a plastic squeegee
When it started to cure, (while green, I geuss) pulled off the masking tape.
Looks good, lasting OK, took me a weekend to do about 2ft x 12ft of deck - being the aft quarter side deck on the side to the marina jetty!
I see no reason why you could not do just the areas that need it now.

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