Crack free timber sealant?

[perky416]

Hi guys,

i am in the middle of building a timber structure in the garden with a fold out roof.

I am after a sealer to fill the gap between 2 pieces of wood to stop water getting in. The is a lot of weight on and off the top piece so there is constant movement and flexing of the wood. I tried a so called "flexible" wood filler but it cracked straight away.

Could anybody recommend anything?

Currently im looking at Gorilla all condition sealer and CT1 sealer & adhesive. Ive never used either so dont know how they will dry. Im guessing to prevent cracking they need to dry soft and flexible like silicone.

thanks

 

[noseall]

The only truly flexible rubber mastic (that is not prone to shrinking) is polysulphide sealant. Good stuff but expensive.