The sealant does wick into cracks just like water but when it dries it seals. The center square support is clearly visible in the photo. Just wet your brush and swab away. It's a good idea to pour some of the sealant into a smaller cup so you don't contaminate the bottle. Use a drop cloth so it doesn't get on your interior. The other 2 square supports can be seen if you look with a flashlight. Do the same thing and swab around where the metal and plastic meet. I used paper towels to check before and after for leaks or you could just leave the towels in there to catch any stray drops.
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