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Oxidation on spoiler

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17K views 35 replies 26 participants last post by  Mmiller  
#1 ·
Hello, I always search the forum for my questions but have been unable to find a solution to this one. My stock spoiler has bad oxidation on top on the entire middle surface, between the two posts (the posts have none for some reason). I've tried waxing, clay bar, Quixx and other scratch removers, just about everything other than repainting, which I doubt I could do well and would be expensive from a dealership. Any thoughts? Thanks. It's easier to see in sunlight, but you should still be able to tell in the pics.
 

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#2 ·
I had the same problem with my spoiler. I had oxidation all over it. And I couldn't stand it so I had to get it fixed. I took it to the dealership and asked how much it would cost. But I had also hit a deer so it was just added in to the cost of insurance. But to get it painted at the dealership shouldnt be more than $100. And plus, if you go to the dealership to get it painted, you know the paint will match.
 
#3 ·
Depending on the year of you Tib, the paint warranty is 3 years/36k. Hyundai had had issues with the paint on the Tibs, I had my spoiler repainted, the gas cap, the gills under warranty.
 
#6 ·
I've used a number of compounds on my spoiler and concluded that the clearcoat must be wearing very quickly causing the paint to fade in the process. It's a well-known issue with the painted plastic parts on the exterior. The paint is high quality but the application process on plastic (priming, etc) is notorious for being shoddy.
 
#8 ·
wetsanding and polish will only be a temporary fix, after a few months the oxidation will come back. The spoilers on our cars are pretty much destined to oxidize, actually if you look I'm sure your gills will be starting to oxidize as well. Plastic parts require different paint additives than the paint on the rest of your car. These additives make the paint softer so it can flex, it also makes the paint more susceptible to enviromental damage. This is why the spoiler is one of the first parts to oxidize. Your best bet is to just have the your spoiler repainted, wet sanding will just be an effort in futility. Actually, in most cases after wet sanding the are needs to be re-sprayed with clear to match the rest of the car. So if you want the long term fix, paint is the only choice.
 
#9 ·
yea i agree with sams2k, find yourself a friend with a dual random or rotary polisher. id start with med to light compounding, moving to heavy/wool compounding, if that does not work wetsand and polish. if that doesnt work, paint.
 
#10 ·
When my spoiler began to gunk up like that, I ended up taking it to a body shop and have them repaint it. They did it for only $75.00 and did a really good job. Before finally giving in and repainting, I had tried Quixx, buffing it out with a rotary tool and polishing, and sandpapering. None of those had worked for me. New paint FTW!!
 
#12 ·
The rotary and wetsanding method will be a good place to start, but one can't help but wonder what it's worth, especially if repainting for under a hundred bucks will solve the problem for good.

Not to mention, with oxidation like that, there's no way you'll get it to look like new again.

So therefore, if you can afford it, I vote repaint.
 
#13 ·
Same here. Two small spots on the wing that have the pattern of rust like on an old car but it's obviousdly the clearcoat that is damaged. I too tried Quixx, Meguier's, etc. and nothing works. I plan on switching to the high spoiler anyway so I'm leaving it as is. Plus, I need a repaint all over because of the key scratches everywhere.

Good luck with whatever you decide to do.
 
#15 ·
I dont know if this oxidation problem is the same as mine where my spoiler has about 1 billion scratches on it.....I tried polishing (Nu Finish polish) with a rotary buffer it did not help one single bit. Knock on wood, this is only happening on my spoiler and nowhere else.
 
#16 ·
I had the same problem and tried the same solution--it didn't work. I ended up getting my spoiler repainted at a body shop for $75.00.
 
#18 ·
I just had my gills repainted and gass cap cause of oxidation, and well saddly to say after i put them on my car they seemed a little whiter than the car paint-my car is white btw-but i dnt think the shop could have used the wrong paint cause the guy took down my paint code??? any reasons why they might seem a brighter white??? possibly just due tp them being plastic? or because the paint on them is fresher than my car paint?
 
#20 ·
it is because white is hard to match. when color matching it is wise for the painter to not use the color code and use your own car to come up with the color. this will give you the best match possible, especially since colors change under different temperatures sun exposure. so have a shop take a panel to use it to match any newly painted parts.


once the clear is gone off from the spoiler or plastic pieces, it is too late and you must repaint. if there is still clear there, i sugguest a sanding block and 4k grit wetsanding. if that doesnt work, repaint time.
 
#19 ·
Same here my stock factory spoiler is oxidized VERY badly. But no big deal as I am about to replace the spoiler. Orbital buffer and heavy grade rubbing compund did not work for me, not sure about the wetsanding though as I do not trust my self enough to do something like that :3_headsha
 
#22 ·
im having the same problem. but i think there was a problem with the paint on 03 rally reds anyway? im having terrible issues; fuel door oxidized bad (i buffed it down so hard some of the paint is completely gone on an edge), spoiler (topside between towers is oxidized), gills (severe fade), and half the paint is chipped off both side mirrors, top only. im not sure whether i should just have specific parts repainted or get my whole baby redone. nothing worked on the spoiler but the heavy buffing did help on the fuel door (except where i went overboard and rubbed all the paint off one edge. the damage was DEEP :*( )
 
#23 ·
It's common that the fuel door, gills, and spoiler fade because they used crappy paint on the plastics. A problem you may run into if you just repaint them rally red is the rest of the paint may look faded so you may have to get it all redone.
 
#26 ·
Hm... I just went after the deep scratches and oxidation on my spoiler with a low speed rotary tool and some polishing compound. Unfortunately the damage is all the way through the paint to the fiberglass and now its smooth instead of rough but even heavy rubbing compound could not smooth out the damage before a couple white spots came through. So glad I'm going wingless soon....
 
#28 ·
It's because the wing, gas cap, and gills are plastic so they scratch easier. Hyundai used crappy paint so it fades over time making the scratches more noticeable.
 
#32 ·
My side mirrors are okay, but I had my gills and gas cap fade bad. The gills were somewhat tolerable, but the gas cap had nearly no paint and it's an 05 Rally Red. I repainted the gills and gas cap myself, but now I see the actual clear coat peeling off the spoiler. Perhaps I'm wrong, but I think that is the result of oxidizing? In any case, I can see that there's no point in trying to salvage the exisitng paint, so I'm having the spoiler repainted along with my side skirts. The spoiler is pretty light weight so I'm guessing it's all plastic as well.

In the process of repainting gas cap and gills, I learned that you need to apply 1 of 2 things. A plastic paint adherence promoter, or paint that is specifically designed to adhere to plastic like sem paint. I heard the name 'bulldog' tossed around while I was on the hunt too so that may be another solution.
 
#33 ·
+100

Yes it's the clear coat actually failing on these parts. I have an 04 Rally Red and the first to go was my gas cap which i repainted gunmetal. The gill's clear coat is dying a slow death but what really has gone to $hit is my hi-spoiler.

I posted something about possibly wet sanding the clear off the spoiler and re-spraying clearcoat on the factory base coat to fix the issue. I don't know what kind of clearcoat was used on the plastics but it's not lasting the test of time at all. Conversly for me, my side mirrors are just as shiney as the rest of the car.

For the record my car has never been garaged, I am the only owner and I wash it about 3-4 times a month and wax seasonally.