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After much deliberation between the after market seal vs the OEM, I
decided I want the OEM one.

I don't know your reasoning for OEM but I've just received my Bus Depot
pop-top seals and I have to say I'm very impressed with the quality. 

Before I put them on I cleaned the pop-top of my 83.5 Westy, it hadn't
been touched since it was new by the look of it. I used a rotary buffer
with a sponge pad and fine automotive rubbing compound. The top came up
like new. The fiberglass gleams. 3M also makes a product that is a
Marine fiberglass cleaner and wax. I saw it in a marine store for $16
and Walmart for $8. I can't comment on how well it works because it
contains silicone and the van is in my friend's body shop and apparently
the silicone particles will hang around for months to come and ruin
every re-spray he attempts.

Should I wax, condition, whatever... the top?