Quote:
Originally Posted by look 171
Thomson's sealer do not work after a few months.
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Yup to that. I sealed a small section of french drain in the shade last year, after power washing spotless, but instantly got heavy green mildew/leaf stain again this year.
Hot and dry conditions will help with surface penetration.
Apply in the late afternoon. Work fast for consistency.
Slower cure will help give the chemicals a longer bond time.