got a question..i took my rear spoiler of last night (getting my car painted)anyway,is there a rubber gasket that goes on the studs of the spoiler,between the spoiler and the trunk lid...i'm asking because i saw this ring there after i took my spoiler's off.or is that just hard dirt build up after all this years...1978 z28 ....luis

That's what left of the gasket. It is supposed to keep water out of the trunk. Given how many rotted trunk pans there are on 2gen cars I'll let you decide how well these things worked.

ok..could i just used some type of water sealant on the studs?...

I plan to use a bead of RTV around each hole in the trunk lid then carefully install the spoiler.

I don't think sealer on the threads of the studs would be as effective because the holes are too big.

I just posted this on another spoiler question. I used stip caulk (or finger caulk whichever you prefer) It is dirt cheap and is the conisitency of modeling clay. You can roll it in your hands like clay and form O's that you can either put around the stud or place centered on the holes. When tightened, the caulk flattens and fills the gap around the stud. I am not so sure that a similar substance was not used at the factory as the "gaskets" that were around my spoiler studs were actually this type of compound. I just think that either RTV or seam sealer is not heavily bodied enough to really fill the gap. If you have to then pull the spoiler this stuff will pull right off. Your choice, I thought that I would give you another option.
Brent

earlysecond hit it right on the head. That clay-like caulk is exactly what GM used to seal the spoilers originally. If you were lucky enough, (or unlucky enough) to remove one when they were newer, the stuff was still soft and clay-like. By now, it is all dried up, and all you see is the dirty ring after it crumbles and falls off.

I highly recommend using the strip caulk. It is easy to work with seals great and won't react with the paint. Don't use RTV. it is difficult to remove and can react to some paints while it is curing. Use on the engine where it belongs.

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69 SS 350 4 Speed
75 400 4 Speed
93 Z28 6 Speed

thanks guys i'll go with the strip chalks...

Just come by and pick some up.....