Repair tape maybe your best best if you ve seen that the cause of the leak is a physical hole to your plastic conservatory roof.
Plastic conservatory roof leaking.
Slipped or cracked conservatory panels can be repositioned resealed or replaced entirely to eliminate leaks and restore the watertight seals of a once leaking conservatory roof.
The fowong butyl tape works to repair cracked roofs across multiple surfaces including metal fibreglass wood textile plastic aluminium and more.
A conservatory roof leaking in centre could be due to a slipped or incorrectly fitted roof panel a cracked glazing unit or a perished seal.
Our advice would be to get a conservatory roof specialist to visit and check out the scope of the repair work.
For what it counts and based on your initial message you may not need to replace the polycarbonate just the rubber seals and maybe underside spacer strips if any.