Adding particulate mineral to absorb water will not fgive you the the degree of swell you are looking for. You will need to add a water absorbant polymer such as crosslinked polyvinyl alcohol,this will swell considerably and swell your compound as a whole
Adjust the amount to suit.
There are other water swellable polymers, but this is the route to take
Johhnymat
Adjust the amount to suit.
There are other water swellable polymers, but this is the route to take
Johhnymat