Can anyone point me in a good direction for SikaFlex tips? The stuff is crazy waterproof but a real bear to work with.
I have not worked with that product, but I have used other silicone products.
One way to make nice crisp lines is to run electrical tape down both sides of the joint with some set back, say 1/4 inch.
Apply the sealant tapering in thickness toward the tape. Once you have it applied, peel of the tape at an angle away from the joint.
Makes a clean line every time with a little practice.