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Bought my 2000 Base Coupe last October, 30,000 miles, seems like it had been very well looked after. Anyway, had small creaking noises occasionally from where interior panels meet, annoying on rougher roads, but not too bad. It recently, last week or two, got much worse. Drove me crazy. Last night I went through it all, made sure nothing was loose, didn't find a problem. So I just hit the spots where interior panels meet, mainly around the halo, with silicone spray lube. Made sure to get the spots where the fasteners are. Five minutes into a ride afterwards, and it now doesn't just "look" new, it sounds new as well. Well worth the small effort.
I really now just think age has "dried" and maybe "deformed" the interior panels a bit, unnoticeable to the eye. I can live with lubing the mating areas and fasteners once in a while. We'll see. How often it has to be done will determine my next move. If necessary, I suppose I could replace the fasteners, but if I can just lube it, even once or twice a year, I think I'll stick with that
Get some .5 inch wide felt rolls with an adhesive backing. Put this on one side of where the panels come together. This will stop the plastic to plastic noise.
Clean up any of the lubricants you used since these can and will run down the panels and cause discoloration. Depending on the lubricant it may also dissolve the plastic.
You can get the felt rolls on Amazon for about $10 to $15.
Thanks for the heads up Gary. Did this yesterday, and I've been keeping an eye for any sign of seeping out, nothing yet. I sprayed a piece of an old plastic dash panel from another car before I sprayed it in my vette, it just seemed to soak in sort of and felt kind of wax like. Got some on my hand, slippery as hell. Silicone spray lube is supposed to be safe for just about anything I believe, but on your advice I will at a minimum keep a very close eye on it for long enough to be sure it doesn't cause damage. If I had thought of it I probably would have done as you've suggested instead.