Do to steering control at high speeds. If you don't feel that would be an issue for you, you can do the bottom.
For people who want System X, I use the extreme SS https://www.systemx.com/products/
For people who want something that is very durable and budget friendly, I use TEC 580 https://www.technicianschoice.net/products.asp?C0=1&C1=9&C2=0#
On all my coatings I use TEC 582 as a maintenance refresher to keep the coating super slick. The slicker it is the less time debris has time to contaminate the surface. https://www.technicianschoice.net/products.asp?C0=1&C1=9&C2=0#
If you are doing it yourself I would use the TEC 580. It is very easy to work with, flash time is about 30 seconds and is very forgiving. The system x flashes in 10-15 seconds and is not forgiving.
Flash is the point where you level out your high spots.
Are you going to cut and polish the gel to remove all the oxidation?