Hi All I have built a 4 mtr long, 1mtr high garden "Trough"/ raised bed!, with 2.5 cm gap between two layers of GP1 blocks,unfortunately before seeking advice the channel has now been filled with top soil,the wall has had a scratch and a top coat with stipple effect ready for masonry paint, the problem is will damp penetrate from inside and "damage" the paint, do I need to coat the wall with sealant before painting? I do not mind re-painting annually, help please.
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