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?

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dadiOH
____________________________

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