Not used blackjack used this
https://www.sealantsandtoolsdirect.co.u ... gKPBPD_BwE
As a surface treatment, easily applied with a 2litre spray bottle….
I’ve poured it over stone walls, in cracks to help prevent water ingress and it didn’t stain
Garage Floor Damp Issue... Any suggestions please?
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Re: Garage Floor Damp Issue... Any suggestions please?
Not sure which version of Blackjack you are using, but if it is brown coloured it will dry out to black. Do not paint it with an oil based paint (or bitumen) as the finished layer can be oil soluble and will be damaged. If you paint it with a water based paint the Blackjack is likely to bleed through,