Waterproofing grout - Can it be done?

Hello,

Im thinking of waterproofing the grout between the tiles around the bath after being told that the grout may not be waterproof.
The bath is also used as a shower and water from the shower tends to pour down the tiles and back into the bath. I've recently fitted a Tele-flex seal onto the tiles around the edge of the bath and I want to stop any more leaks before they occur.
My question is, is there anything available which I can just apply with a small brush?
If so then what and where can I get it?

Thanks in advance


PS
For anybody who may be experiencing a leaking bath seal. The Teleflex seal is highly recommended and available from B&Q and screwfix for about £30. Brilliant product and worth every penny

My question is, is there anything available which I can just apply with a small brush?

No not that I'm aware of, plnety of additives available that enhance the grout, but not a paint on cure all as far as I know.

HG do a product called super protector for wall and wall grout whihc is a transparent paint on fluid. It seals the pores in the grout making it impervious to dirt, grease and moisture,

IUndeed, it soaks in to the grout and make that impervious, but it doesn't make the grout any more of a waterproof barrier then it was before.