Q1. What are these panels made of?
A1. It's made from PVC, which is thin, light-weight, and is easy to cut.
Q2. Is there any visible lines/gaps between each panel?
A2. There will be small gaps in between. To create a better look, you can fill in the gaps with white caulk, and smooth it out with a sand paper after it dried out. Paint tape is also recommended to keep your product clean.