Rain spotting issues

How do you deal with rain spotting on the surface of a wall?

Asked by Kelly on 12th Apr 2021
Expert Trade Answers
"Rain spotting on the surface of a wall can be unsightly and can also lead to mold and mildew growth if not properly addressed. Here are some steps you can take to deal with rain spotting:

Clean the wall: Use a mild detergent and water to clean the surface of the wall, removing any dirt or debris that may be contributing to the spotting.

Rinse the wall: After cleaning the wall, rinse it thoroughly with clean water to remove any leftover soap residue.

Apply a waterproofing agent: Apply a waterproofing agent to the surface of the wall to help prevent further water penetration. You can use a commercial waterproofing agent or a silicone-based sealer.

Address any leaks: If the rain spotting is a result of a leak in your roof or other structural issue, it is important to address the underlying problem to prevent further damage.

Consider repainting: If the spotting is particularly stubborn, you may need to consider repainting the affected area. Be sure to choose a paint that is formulated to resist water and moisture.

It is important to address rain spotting on walls as soon as possible to prevent further damage and potential health hazards from mold and mildew growth."
Answered on 19th Mar 2023 - Member since Sep 2022 - report
"sand your walls and re paint on a dry day ,,,,,,make sure the wall are dry ,, ,"
Answered on 26th Jun 2022 - Member since Apr 2020 - report
"If it’s outside paint it with waterproof paint. For the best results do it a few times."
Answered on 6th Aug 2021 - Member since Aug 2021 - report
"Hi. I was asked by the Client to use Ronseal Self Cleaning Masonry Paint (they went for standard white). It was south London, next to a very busy road and judging by the surrounding houses - everyone had mix of rain and pollution staining their walls.

After two solid coats I have to say that it did the job and of course got bit greyish and spotted in few days but after first rain it went back to brilliant white, just like after the painting.

Worth trying."
Answered on 14th Apr 2021 - Member since Mar 2021 - report
"Ok rain spots
I would sand do the sevice
Then put down a oil base paint like gloss or damp Course Paint let it dry
Then re paint the the area"
Answered on 12th Dec 2022 - Member since Jul 2022 - report
"If it is indoor water damage to a wall the best result is to sand the surface smooth the use a zinser stain block to remove the stained area, when the results are achieved paint said surface wìth an additional coat."
Answered on 10th Sep 2021 - Member since Jul 2021 - report
"You'll have to sand down that part of the wall but as it may be uneven you might have to do the whole area that is needed ."
Answered on 22nd Jun 2021 - Member since Jan 2021 - report
"You can buy a clear stabiliser, but be careful when you use it.it sticks to everything and its runny like water."
Answered on 12th Apr 2021 - Member since Dec 2018 - report
"The best way is to use ronseal stabilising fluid. It’s a clear solution that is just brushed or rolled on it sticks like pva so easy enough to apply"
Answered on 4th May 2021 - Member since Apr 2021 - report
"Use a stabiliser or sand down and do the wall again in resin paint or silicone-based paint so the rain does not soak in and runs off. Then you can clean it as needed."
Answered on 18th Nov 2021 - Member since Oct 2021 - report
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