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Tim Watts[_3_]

On 27/04/18 16:30, wrote:
As someone said it may dry out once it's all exposed, then no further action needed, just don't re-cover it.

+1

If that doesn't do it, probably time to seal it. But be aware that doing so can sometimes make the walls very damp. Any waterproof coating can dampproof it, eg epoxy, bitumen, etc. Epoxy is the longest lasting. Bitumen's cheap but not good in direct sunlight. You can also get other types of waterproofing compounds.

Bitumen is also a nightmare if you then want to apply any bonded
covering later - nothing sticks to it, except more bitumen.