Help - Yellow stains leaching from masonry on granite wall

Bennio05 · Post by **Bennio05** » Wed Jul 08, 2020 3:56 pm

Hey guys,

I’ve just painted a huge gable with 2 coats of Dulux Weathershield exterior masonry paint.

It was fine for a few days and now it’s gone yellowish where the masonry between the granite blocks are.

It’s pretty unsightly and I’m not happy leaving it for the customer obviously.

Any help with what to do would be greatly appreciated!

Thanks

moderator2 · Post by **moderator2** » Wed Jul 08, 2020 4:01 pm

Moved to painting and decorating.

Puma · Post by **Puma** » Wed Jul 08, 2020 9:20 pm

I would apply two coats of a water based stain blocker stretched a fair way beyond the stain. They are a bit temperamental, they have to be thoroughly mixed and applied according to the instructions or they can fail. Applying any oil based paint over a water based can cause problems where damp is involved and especially over a broad area.