Will new silicone stick to old silicone? I think not but thought I'd ask.
My ex-father in law put a glass block window in one of the showers in the house my wife inherited recently. They aren't standard, mortar in blocks, they are a kit using a plastic frame and thin (80mm +-) blocks which are held together and in the frame with silicone and thin metal/plastic spacers that fit into recesses on the block edges.
After the thing is put together, the joints are caulked with silicone and it is here that ex-FIL messed up the most...I've seen smoother cobblestone roads. I would like to cut off the worst of it and apply new, making it smoother. Yay or nay?