Need advice on my new walls.

[redarrow]

Advance thank you.

Me and my dad have recently fixed my out doors walls, we have rendered all the out side walls.

we need to no what is the best pvc you can recommend to put on top of the new rendered walls thank you.

we need the walls to be water proof to stop rain, i think we have done that, but want to protect the wall's even further with a adhesive.

Thank you redarrow.

Ps. I was going to use waterproof unbound?