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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Yellowing headlights in Past Cadillac Vehicle Discussion; Originally Posted by GM_Ridin' I'm having trouble attaching the before and after pics from my phone but I plan on ...
  1. #76
    basscatt's Avatar
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    Re: Yellowing headlights

    Quote Originally Posted by GM_Ridin' View Post
    I'm having trouble attaching the before and after pics from my phone but I plan on sanding my headlights after about 3 coats of spar urethane. Would you suggest wet or dry sanding (220 grit)?
    =========================
    I plan on sanding my headlights after about 3 coats of spar urethane.
    Would you suggest wet or dry sanding (220 grit)?

    ARE YOU NUTS?
    or maybe you don't understand the whole process -

    "GRIT" refers to how rough/coarse the sandpaper is -
    the BIGGER the number - the SMOOTHER the sandpaper -

    500 grit means it has 500 pieces of grit per square inch -

    1200 grit means 1200 pieces of grit per sq in -
    the pieces of grit are less than half the size of the 500 grit -

    3000 grit is a little rougher than a sheet of copy paper -

    ------------------------------

    you are going to START the process with 500 grit discs -
    this is necessary to cut - or grind through the original coating/surface -

    then go to 800 grit - or 1200 grit -
    this step is to eliminate all the scratches from the 500 grit discs -

    then 3000 grit -
    this is to eliminate the scratches from the 1200 grit discs -

    then rubbing compound that is equivalent to 4000 or 5000 grit -
    yep - this is to get rid of the tiny scratches left by the 3000 grit disc -

    then - the final finishing touch is the new UV coating -
    this also fills the tiny scratches left by the rubbing compound -

    =============
    and THEN you are going to use 220 grit on it? -
    which is TWICE as coarse as the original 500 discs -
    that WILL screw up all the hard work you put into them

    ONE FINAL COAT of the spar urethane is all you need -
    providing you did all the previous steps correctly -

    ======================

    220 grit is considered "fine" paper for WOODWORKING -

  2. #77
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    If you were putting the urethane on a desk, you would sand the WOOD with 220 grit "finishing" sand paper.

    We're talking about a surface that has to be smooth as glass, and completely translucent. If you take 220 paper to the lens, you'll end up with a very, VERY tough lens, that's as translucent as a heavily frosted shower door.

    The urethane goes on the sanded and fully polished lens, NO sanding.

  3. #78
    GM_Ridin' is offline Cadillac Owners Fanatic
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    Yes, you guys are completely correct and I feel stupid for wasting my time (tried the 220) and it didn't work!
    Well the spar urethane spray does not goes on as clear as I expected (a little foggy) so I wish I just got the spar and mineral mix as basscatt suggested.
    Once I get the pics up before I used the spray you can see how well they turned out. So now that I messed it up should I get the urethane off with 3000 grit and compound it again?

  4. #79
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    If you used 220 you're going to have to start from scratch. From 320 all the way up to 1500/2000+, them polish, then urethane again.

    Each grit takes off the sanding scratches from the grit before it. 320 removes 220 scratches, 480 removes 320 scratches..... Using 3000 after 220 would have about as much effect on it as rubbing it with a grocery bag.

  5. #80
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    Re: Yellowing headlights

    Quote Originally Posted by GM_Ridin' View Post
    Yes, you guys are completely correct and I feel stupid for wasting my time (tried the 220) and it didn't work!
    Well the spar urethane spray does not goes on as clear as I expected (a little foggy) so I wish I just got the spar and mineral mix as basscatt suggested.
    Once I get the pics up before I used the spray you can see how well they turned out. So now that I messed it up should I get the urethane off with 3000 grit and compound it again?
    =============================
    you can try using mineral spirits to remove the spray -
    if it has been on for less than 24 hours -

    if that doesn't work -
    you must wait a couple/few days for the spray to completely cure -
    if you don't - it will gum up the sanding discs immediately -

    -----------------------------

    do you have any discs left?

  6. #81
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    It's not just the urethane, he said he "tried the 220". He's back to before step one now.

  7. #82
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    Re: Yellowing headlights

    The lens assemblies may well be terminal after the 220 grit screwup.

    Whoever recommended a 220 wet sanding should be shot. Complete airhead.

  8. #83
    GM_Ridin' is offline Cadillac Owners Fanatic
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    Quote Originally Posted by Submariner409 View Post
    The lens assemblies may well be terminal after the 220 grit screwup.

    Whoever recommended a 220 wet sanding should be shot. Complete airhead.
    Couldn't agree with you more he is such an idiot. That's what I get listening to a reg 9 to 5er just counting down the time to get off pretending to be an expert smh.

    It's not that bad as you think though moist. I actually hit the lens with the 3k grit and then compound again. The 220 sand block actually helped breaking up the spar to come off the lens.

    Practically looks like it did before I screwed up but there are slight imperfections in little corners I missed. So I'm going to hit the lens back up starting at the 800 grit and so forth (bit of a perfectionist).

    Once I do that I will do the spar urethane and mineral spirits mix as ol' bass suggested. Sometimes it's best to listen to the old wise guys. Dang I hate when they're right! Lol.

  9. #84
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    Re: Yellowing headlights

    Just start over, follow the directions and after you spray the 2 or 3 coats of spar urethane, and it dries, simply repeat the last step and polish it with the sponge pad and polishing compound provided in the kit. That's what I did and that is all it takes to bring them crystal clear.

  10. #85
    GM_Ridin' is offline Cadillac Owners Fanatic
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    Quote Originally Posted by Ranger View Post
    Just start over, follow the directions and after you spray the 2 or 3 coats of spar urethane, and it dries, simply repeat the last step and polish it with the sponge pad and polishing compound provided in the kit. That's what I did and that is all it takes to bring them crystal clear.
    I would've but I returned the can and got a little thing of miniwax spar urethane and mineral spirits so Imma try bass' method.

    Hey bass did you just apply this method and leave it or did you have to buff the lights out once it dried?

  11. #86
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    Re: Yellowing headlights

    Quote Originally Posted by GM_Ridin' View Post
    I would've but I returned the can and got a little thing of miniwax spar urethane and mineral spirits so Imma try bass' method.

    Hey bass did you just apply this method and leave it or did you have to buff the lights out once it dried?
    ----------------------------
    Hey bass did you just apply this method and leave it
    or did you have to buff the lights out once it dried?

    the coating is the last step -

    the 50/50 thinned poly will lay perfectly flat -
    no need to do anything else with it -

    in the future - when you wax the cat - I mean wax the CAR -
    include the headlights -

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    Re: Yellowing headlights

    The 3M polishing kit rolled into 87 posts.

  13. #88
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    Re: Yellowing headlights

    Thank God it wasn't something intricate.

  14. #89
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    Ok so I did the 50/50 mix and from experience I must say bass this is the sh*t (excuse my enthusiasm). Wish I would've done this before wasting my time with the spray. Not to say the spray is no good but I prefer this 50/50 method any day! I'll try to post pics later 2nite of my results because from my phone it says file too large and still doesn't work when I resize it.

    ----------

    I know ranger long thread right! Oh well alot of good info for those with no experience with this. I would definitely recommend the 3M kit with the 50/50 method to top off any day. And unless your headlights are just too far gone there's really no need for extra work other than the 3M kit. But I would say take your time on the 500 grit to make everything else smoother. The drill really makes a diff in time and results. Took me about 45 mins to an hour per headlight.

  15. #90
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    Re: Yellowing headlights

    Quote Originally Posted by GM_Ridin' View Post
    Ok so I did the 50/50 mix and from experience I must say bass this is the sh*t (excuse my enthusiasm). Wish I would've done this before wasting my time with the spray. Not to say the spray is no good but I prefer this 50/50 method any day! I'll try to post pics later 2nite of my results because from my phone it says file too large and still doesn't work when I resize it.
    =========================
    Ok so I did the 50/50 mix
    and from experience I must say
    bass this is the sh*t (excuse my enthusiasm).

    yep - it IS the very best solution I/we have come up with -

    can hardly wait for the pics -

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