Product testing, need comments from members
These are easy to make using a product from Dupli-Color called MetalCast. Clean the lenses several times with pure denatured alcohol and make sure they're good and warm before you spray them. Spray to give a barely-wet coat--not a light dust coat, but not so heavy that it drips/sags/runs. Let that coat dry for 20 minutes or so, then give it another coat. Repeat for a third coat. Once the third coat has been left alone to air dry for an hour or so, put the lamps in a low (200°F) electric oven and let 'em sit in there for an hour or so to cure/harden the coating. If your oven is gas rather than electric, don't do this last step until the lamps have air-dried for a day. Let the lamps cool completely, then go ahead and install them. The Metalcast product is specifically meant for good adhesion and durability on hot, slick surfaces (they have chrome in mind…glass isn't all that different) and they seem to hold up well.
France required selective-yellow headlamps from 1936 to 1993 on all vehicles; see here for the explanation. Some racing classes specify selective-yellow headlamps to identify cars in that class. "Amber" isn't the right word or color; that's the color of turn signals. Depending on what state you live in, you might or might not be able to run yellow headlamps on the street without the cops hassling you. Me, I can report that yellow headlamps once got me out of what would have been an expensive 80-in-a-55 speeding ticket. Using any color other than yellow is foolhardy, and using blue or red is also highly illegal. You might have a plausible excuse if you're restoring an old cop car, fire truck, or ambulance, but if you take it on the road, expect to get an expensive Talking-To about it.
Here's my '89 D100 just before I sold it; you can see the difference between the yellow headlamps and the amber turn signals:
These are easy to make using a product from Dupli-Color called MetalCast. Clean the lenses several times with pure denatured alcohol and make sure they're good and warm before you spray them. Spray to give a barely-wet coat--not a light dust coat, but not so heavy that it drips/sags/runs. Let that coat dry for 20 minutes or so, then give it another coat. Repeat for a third coat. Once the third coat has been left alone to air dry for an hour or so, put the lamps in a low (200°F) electric oven and let 'em sit in there for an hour or so to cure/harden the coating. If your oven is gas rather than electric, don't do this last step until the lamps have air-dried for a day. Let the lamps cool completely, then go ahead and install them. The Metalcast product is specifically meant for good adhesion and durability on hot, slick surfaces (they have chrome in mind…glass isn't all that different) and they seem to hold up well.
France required selective-yellow headlamps from 1936 to 1993 on all vehicles; see here for the explanation. Some racing classes specify selective-yellow headlamps to identify cars in that class. "Amber" isn't the right word or color; that's the color of turn signals. Depending on what state you live in, you might or might not be able to run yellow headlamps on the street without the cops hassling you. Me, I can report that yellow headlamps once got me out of what would have been an expensive 80-in-a-55 speeding ticket. Using any color other than yellow is foolhardy, and using blue or red is also highly illegal. You might have a plausible excuse if you're restoring an old cop car, fire truck, or ambulance, but if you take it on the road, expect to get an expensive Talking-To about it.
Here's my '89 D100 just before I sold it; you can see the difference between the yellow headlamps and the amber turn signals: