If it's dry now, what is the point of extensively sealing it?
Other than stopping the pointing from crumbling in 20 years?
Honestly, I'd move the pipes around, blast the walls (I have a Karcher you may borrow) then re-point and whitewash.
Unless you have a problem to solve, such as damp, then this sounds a bit like an exercise in lily-gilding.
@Dammit started
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If it's dry now, what is the point of extensively sealing it?
Other than stopping the pointing from crumbling in 20 years?
Honestly, I'd move the pipes around, blast the walls (I have a Karcher you may borrow) then re-point and whitewash.
Unless you have a problem to solve, such as damp, then this sounds a bit like an exercise in lily-gilding.