How to Handle Mildew on Exterior Window Trim Caulk Before Painting?

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Asked By W1nd0wNinja92 On

Hey everyone! I'm in the process of prepping my exterior window trim for paint and I've hit a snag. The caulk around my windows has developed a black mildew appearance, and I want to address this issue before I take the plunge and start painting. Would it be possible to clean it with a bleach solution and some light scrubbing, or would it be better to completely remove and re-caulk? I'm wondering if stripping out the old caulk and replacing it might actually be easier in the long run. Any tips and tricks would be super helpful!

1 Answer

Answered By ToolB0xHero3 On

It looks like you’re dealing with silicone caulk, which can be tricky because it won’t hold paint well. I recommend cutting it all out completely. Once you’ve removed the old caulk, go for a urethane caulk for the reapplication – it’ll give you a better finish for painting.

W1nd0wNinja92 -

Thanks for the tip! When you say urethane, do you mean something like an exterior-grade silicone caulk? I'm also thinking of just replacing all the caulk around my windows since they’re all similar in age. Do you think that's overkill or a smart move?

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