Drip rail sealant?

when you put the new sealer in. lay down 2 layer thick of quality masking tape on both edges. then lay your sealer in. I wear a latex glove and get a small cup of mineral spirits handy. spread/smooth it out with your finger first. dont need it very thick. then dip finger in mineral spirits and use very light pressure to even it all out and make smooth. let it start to tack up a bit then go back and peel off your tape. this will leave a nice sharp line in the channel and will make it look alot better.