im new to making liveries but i got a pretty good at it. im having trouble with replacing the reflective.ytd file with the livery i made. when i spawn the car in game the reflective parts show up as patches on the car. im not sure what it is if anyone could try and help me thatd be great, thank you.

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What do you mean by "patches" on the car, when you spawn in game? Are you able to post some pics? Also, post screenshots of what the YTD list for that model looks like in OpenIV - showing what the main livery layer looks like, as well as the reflective layer. And, maybe a screenshot of what the model looks like in OpenIV.

In general, though..........

- just to confirm - when you make your reflect layer, you are essentially just "turning off" the main base body colour layer, and only leaving the decal design layer/s (the striping, text, door badge, etc) visible, right?

- do you have multiple liveries (sign_1, sign_2, etc) loaded onto a single model? Maybe, with different unit callsign numbers.......or the same livery, but maybe Supervisor markings or whatever? Any chance you might be trying to then install multiple reflective layers? Wonder if that might be causing a bit of a conflict? You can only have a single reflective layer installed - even if you have multiple primary liveries.
- obviously......the model is designed to have a reflective layer? Probably a dumb question, sorry - but, setting up a reflective layer is something the model dev actually has to do. We, as livery devs, can't just go ahead and add a reflective layer to any model we want.

- also.........if it is the same patchiness I am thinking of - might just be the way it is. I worked on a livery for a model a few months ago, and ran into a (maybe) similar sounding issue. Here are a few screenshots.......

You can really see how on the rear chevrons, the reflective layer is kinda........patchy? Some parts do reflect, and some don't. Some parts of the rear door decals don't seem to reflect either. And, even on the sides of the model, some parts don't seem to be reflective. Not sure if this is similar to what you are experiencing?

Initially - I thought it was something I had done wrong on my livery, and setting up my reflective layer. But, I did the same stuff as I have done in the past. I then check the original livery/reflective layer on the model provided by the dev. And, sure enough.......the same issues. That led me to decide that it was most likely a problem on the dev side of things - that they didn't set up the reflective layer correctly.

Anyhow - maybe this answers your question? Post some pics........maybe we can figure it out.