Replacing a sunroof seal can be done at home, but it requires care and preparation as well as the right sealant to ensure a watertight closure. You may wish to try local garages or independent Renault specialists for a quote and compare this with the time and cost of doing it at home. If you do plan to replace it yourself we would suggest contacting the parts department at your local Renault dealer for an original part, or try independent Renault parts specialists to ensure the seal is of the right quality.