bumpers, sills, mirrors & boot spoilers go 'purple'. T-cutting/polishing them will only make them shiny purple!
The bonnet usually goes pink & will respond to t-cut etc as will the rest of the bodywork.
Just for a moment, stop being so defensive and be logical. Laquer is a layer of clearcoat that sits on top of the coloured paint. It is clear and incases the paint. If the abrasive polish is rubbed on the clear laquer, it will polish the clear layer and have no contact with the colour paint.
If you are t-cutting and there is red on the cloth, yes, you are indeed t-cutting the colour layer, but that means the laquer has gone. Machine polishing, with something like G3, will remove the laquer and restore the colour. Give it a good polish and you will have a nice finish, arguably better than the laquered pink, but it will not have a laquer protection.
I am tempted to do this to my Gtv as mine is very pink and I know it will polish up red and look alot better, but at the moment I like the idea of the laquer protection.
I don't doubt some of you guys are t-cutting your cars, but that is because your laquer has gone.
you are right but also a little bit wrong, me too.
I've just tried, with G3 on a clean rag, polishing various red panels etc.
An original roof with laquer peeling(see pic), original front bumper(purple), a boot lid painted last year & recently painted cup side skirts-on different GTVs.
The results on the rag are; roof laquered-clear, roof laquer peeled-red, bumper-clear, boot lid-pink & side skirt-pink.
So you are correct in that polishing a laquered panel is making the laquer clearer not touching the colour underneath & polishing the basecoat makes the colour brighter but you would not be able to successfully polish the laquer coat off evenly, only burn through in places. The laquer is very hard but unfortunately it can start to peel off but not to leave a whole panel ready for polishing as the basecoat is quite soft & thin in comparison.
I'm still not sure why the 2 parts that made the rag pink did this, on Monday I'll ask the paintshop what paint they use. I thought they used laquer but maybe not, although on metallics I think they have to, & they usually colour blend in half the adjoining panels & then laquer all three.
Old red GTVs are quite a bit lighter in colour to the original as you can see in the pic below.
The unlaquered section being much darker than the rest of the roof so it must be the laquer that is being turned 'yellow' over time by the sun. A good wax does help prevent this, not just a wash'n'wax. Having only 1, or only a few, panels painted on a red car therefore presents the painter with a problem matching to the remaing panels on the car. A good paintshop will tint down the colour to try & match the existing colour otherwise you end up with a 2 or 3 tone car. Which, unfortunately, is how it will probablyend up in a few years anyway.
Who said red GTVs were the best, Cup owners?
Sorry about the picture quality, taken with my phone, but it still shows the different shades.