Think one of my Skylights may need a re-seal.
What sealant would you recommend?
Assume if it does best to remove all old sealant and replace all as new?
The hardest part of re-sealing is removing the old mastic and you are correct - you do need to remove it all. Sharpened plastic used as a scraper will remove most of it. Use White Spirit to clean off the remnants.
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