>> I'm guessing that's similar to the concrete and masonry treatment they 
>> talk about. If it makes concrete less porous, chances are it'll work 
>> for other things as well...
> 
> Yes, it even makes pots that have cracks waterproof again.

...or fills gaps in gaskets...

>> (I wonder if it works for wood?)
> 
> AFAIK wood is generally not porous.

Yes it is. Wood's entire structure is composed of long tubes designed to 
channel water (from the roots to the leaves). This makes wood quite 
water-absorbant.

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