I have a shed with what looks like bitumen corrugated roof sheets. The coloured srifacr to the sheets has worn away over the last year and water now seems to be slowly sleeping through. Can you recommend a surface treatment paint that I can use to repair sheeting with and regain waterproofing. I was looking at the Britannia aqua shield. This seemed to be suitable and lower cost.
Assuming the corrugated roof sheets are bitumen, cleaned, dry and sound we can recommend Britannia Aquashield High Build.
If the corrugated sheets are fibrous cement corrugated sheeting then two coats of Aquashield Primer must always be applied to this substrate prior to application.