Q:
Could you please let me know if the Bonda Marine G4 Primer Sealer can be applied to a red brick wall to prevent damp coming through?

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A:
Yes, G4 will bond to pretty much all porous surfaces, including brick. G4 Primer Sealer is essentially the same product as G4 Damp Seal which will have better labelling for your purpose.

CFS - G4 Damp Seal