Shower grout problem

[emailrob]

I've recently re grouted my shower and changed the awful wood panelling (previous person put it in around the bath, yuk). with tiles.
That side of it works fine, However as you can see in the enclosed picture, the plastic surround I have added on to seal over the edge of the tiles will not stick properly.
It has been stuck down with lots of grout so that it seals, and water cannot get through and behind the tiles. However this still seems to be happening.
It's standard waterproof grout.
I thought it may be better to use silicon under the plastic strip and a line down both edges of the strip, which should make a better seal. What do you think? Any better ideas?

I'm also concerned that the thick grout I've used between the horizontal and vertical tiles will not withstand lots of water. Any other ideas? Could this be better sealed with a waterproof paint / varnish?

Thanks as ever.

hope you like my bathroom

 

[mikeyredtop]

ive just done my bathroom and that grout is a brastuard to get off if u leave it to go hard, u can get get ceramic tile type strips instead of ur plastic thing which maybe why its not stickin properly...being plastic.

 

[emailrob]

thanks mikeyredtop, do you know where I can get this strip from? From a standard DIY place?

 

[mikeyredtop]

b&q they are 5inces long so will need a few