So I removed the old sealant with a sharp blade, thoroughly cleaned the surfaces with mineral turps, and applied the new sealant and let it dry. No problem so far, but then about 3-4 months later it starts to go yellow and small black spots appear within the sealant. This is the second time it's happened-what am I doing wrong? I don't finish the application off by licking my finger and wiping it! via /r/DIY http://ift.tt/2mqWrFb
