If You Had A Twin, But Didn't Realise...
Family Life15 mins ago
No best answer has yet been selected by poppie. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.I mentioned PVA in answer to your original question - that is for use on internal walls. I'm not sure if it's suitable for this particular application, but there's a list of its uses here