it'll come back for sure,i think it just 'fills' in the scratch and over time will re-appear in time,best way is to do what i suggested in my previous reply

I posted a link to this, because it worked for me, might not last forever, but it's lasted a couple of years so far and if it wears off, I'll do it again.
Main thing is, give it a wax coat after trying this method, that seems to seal it.
I know some cynics might think it's nonsense, all I can say is, don't knock it until you've tried it.

As ither members have suggested it depends in the depth on the scratch. The following scratch I removed using Meguairs Ultimate Compound, follwed bt Autoglym Super Resin Polish and finished with Autoglym Extra Gloss Protector.

http://i1280.photobucket.com/albums/...pspelvdmqe.jpg

http://i1280.photobucket.com/albums/...psl8ebfomh.jpg

Anyone trying the Youtube link in this post would do well to watch the next video in the link before trying.

Thats a nice bit of "Neving"

If its not got to the base coat and still has the color brasso will will take the scratch away and the repolish the area. Takes time but you do get a good result . The same for the head lights when they become yellow .

If it is not through to the base coat/primer, you could use a cutting compound or T-Cut to smooth the surface around the scratch to the same level of the scratched area, eliminating the scratch.

Other deeper scratches will need touched up, however you can lessen their visible effect with polishes and compounds. How these, and WD40 and even water work is, by deflecting the light around the scratch making it less obvious. The scratch will still be there of course, but it wont catch your eye as much, as the light reflecting off the sharp edge will have been smoothed off by the compound, or filled with the polish (and water/WD40 etc). The compound will be a longer effect, however as dirt builds up inside the scratch (I am talking tiny pieces of dirt here) it will build up the sharp edge again reflecting the light. In the case of WD/water and polishes, it will simply wash away and the scratch will become 'sharp' again therefore visible.

I have seen careful application of blending lacquer re liquefy a small area of paint temporarily, thus allows the very clean scratch to be eliminated and one solidified the surface can be re polished...

A lot of the methods before, are removing material to get down past the scratch, if the scratch is only in the laquer layer , it is much better to clean and touch up/fill with fresh laquer using a fine brush, and then rub back the touch up with 3000 grit paper and then polish off . otherwise you will alway be thinning the laquer layer to the point of no return ;);)

C.