If you want to seal your RV/ Truck camper roof once and for all, then this is the method. It requires a lot of work and is somewhat costly, but ultimately, it is worth it.
Turbo Poly Seal and Super Silicone Seal – https://bergstromm.com/

16-step instructions for preparing and sealing an RV or truck camper roof:

1. Remove obstacles: Detach any roof racks or attachments that block access to the roof surface.

2. Strip old materials: Use an angle grinder with a steel-bristle brush to clear away caulk, paint buildup, and residue.

3. Expose critical areas: Strip paint around the air vent flashing and at least two inches beyond it.

4. Clean joints: Remove sealant or caulking along the roof perimeter and joints.

5. Prepare the surface: Use the angle grinder to take off most of the old paint—there’s no need to grind down to bare metal.

6. Clear debris: Blow the roof clean of dust using a leaf blower.

7. Wipe down: Use lacquer thinner to clean the entire surface; this is essential since the grinder can melt and spread silicone.

8. Tape off edges: Apply painter’s tape around the perimeter, leaving a 1.5-inch space from the termination bar.

9. Apply base coat: Brush a thick coat of Turbo Poly Seal over the termination bar and onto the roof.

10. Install fleece: Cut polyester fleece into two-inch strips and place them over the termination bar, ensuring no gaps underneath.

11. Seal the fleece: Apply another coat of Turbo Poly Seal to fully cover the fleece.

12. Add protective coat: After about 40 minutes, apply a coat of Silver Coat protection over the Turbo Poly Seal.

13. Remove tape: Carefully pull off the painter’s tape.

14. Final roof coating: Wait 24 hours, then use a nine-inch roller with a quarter-inch nap to evenly apply Super Silicone Seal across the roof.

15. Cure time: Allow the silicone to cure for 48 hours before walking on the roof.

16. Reattach fixtures: Once everything is cured, reinstall the roof racks and any other attachments.

Chapters:
0:00 How to Seal RV Camper Roof
1:05 Cleaning up old caulking and paint
4:55 Lacquer Thiiners to wipe everything clean
5:35 Applying Turbo Poly Seal on the edges
7:05 Coat entire surface with Super Silicone Seal

Chapters:
0:00 RV camper roof sealed
1:05 Cleaning and preparing
5:26 Seal the trim with Turbo Poly Seal
7:08 Coating roof with Super Silicone Seal
8:45 Results are amazing