Paint question on two Revellogram NASCAR models

IT is possible that the transparent colors would be used on the AN fittings in the engine compartment.AN fittings are used on radiator,brake and fuel lines.

After looking at some google images of them, I'm sure you're right. I'll check the kit parts for joints that look like ANs. Thanks a bunch for the assist.

I'm also wondering why I had to go look at a picture of an AN fitting when the planes I used to fix had about a million of the bloody things. Oh well, memory fades...