I purchased some form Ace Fogdall in Iowa 800-747-0747. I bought too much, and have since sold it. If you have the right stuff it just may be an issue of installtion instuctions. I have attached the instructions I sent to the member who bought my excess.
Here are the directions
First I get a rough measurement of length and cut it a bit longer, The using the How to start
picture get one edge in.
You can gently bend the insert to get the end started and pop it in, but be careful as it will stress it to the point of turning it white. The look you are going for is in the picture Getting in the first inch
Then using a screwdriver push the molding up into place and pop it in. I was able to do this in half inch increments. I recommend a smooth handled screwdriver or you will have blisters by the time you are done. See Pushing it in
. The screwdriver will rest in the notch created in the molding to hold it in.
Get it near the end and trim to fit before you get the final end in.
The picture shows it installed but not yet caulked.
I love the way it looks installed, I think you will too.