if your hooves are chipping and cracking like that then you either need to go to a shorter shoeing cycle or talk to your farrier about hoof balance.
Research has shown that good hoof health comes from the inside out. Tropicals do nothing besides make the owner feel better.
I have to say that the topicals do help, and I know that some people prefer other methods,and that is also perfectly fine.
Here is my experience with it. I use Pedocan (super hoof conditioner but it's green) on my mare's feet all during show season. Her feet aren't too long and my farrier does an excellent job on her but we travel to so many different shows and spend the night at different places that her feet get all out of whack. The changes in bedding, and all of the varying screening in the show pens dries her feet out very badly, and despite having shoes on the bottoms begin to crack and get holes above the shoe line. Then, before you know it, TING, off come the aluminums.
When I talked to my farrier about it he recommended using this moisturizer and doing exactly what you described doing, coating the outside and inside, which he said many people forget. Lo and behold, by the end of this show season we did not have one crack or chip. I can't argue with those kind of results. I always immediatey pick out her hooves when I'm done riding and then coat her feet. I figure once I am done with the rest of the grooming it has soaked in enough to throw her in her stall with the shavings with some hay in front.
Now that show season is over I haven't had to use it once. Going into fall it's wet enough and the sand in our arena at home doesn't dry her out nearly as bad as the screenings.