r/HomeImprovement • u/tarlala • 1d ago

Previous Thompson Water Seal

Hey everyone,

2 summers ago my next door neighbor said I should use Thompson water seal on my rooftop deck. He set me up with his pressure washer and I used it to prep my deck before we both sealed it. He died. Some parts of my deck are green. First time in 10 years of living here. What would be the best way to clean it and re-seal it? I live in a very rainy area. The deck also being uncovered mostly and on the roof gets a lot of direct sun (and very hot) in our summer season.

Thank you

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u/Quincy_Wagstaff 1d ago

Wet and Forget would be a good start.

30 Second Outdoor Cleaner is much faster, but it could cause staining issues if it drips on things below.

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u/AbsolutelyPink 20h ago

Just FYI Thompson is crap. Next, you will need to remove the mildew with Wet n Forget outdoor, a bleach solution or any number of mildew killers. Power wash, you might need to sand. Then look at Cabot sealers. You will need to redo it every couple years regardless.