Hi All. I had a coolant issue (reservoir replaced by dealership under warranty). But now I have this coolant stain on the front trim. You can only see it under direct sunlight or with a flashlight, but I know it’s there. Mother’s back to black didn’t help. Any thoughts?

also I still smell coolant every time I take it out. The coolant level is remaining the same, so I’m assuming it’s just in the engine bay somewhere. How long does it take to dissipate?

 

The color is stained in the plastic. Just spray paint it.

 

Might be cheaper and/or easier just to buy a new piece. I don't think that part is that expensive.

 

I think it depends on the finish/material.
On most F-Types this piece is painted gloss black and the stain should polish out, but I understand some are matte black and the OP's looks like it might be judging by the pic in his first post, in which case I doubt it would polish out.
As Mahjik said the best bet may be to simply replace it with a new one, I did that on my F-Type some 3.5 years ago now, the part is not all that expensive and it's a fairly easy DIY.

 

It’s matte black. I’ll ask at the dealership about replacement. Fingers crossed I’ll inquire about replacement being under warranty due to the coolant leak occurring due to a known issue.

 

Yep, defo the way to go.
Also with your second question - "also I still smell coolant every time I take it out. The coolant level is remaining the same, so I’m assuming it’s just in the engine bay somewhere. How long does it take to dissipate?" - yep, when you get a large coolant leak (like you must have had to cause that amount of damage to the trim piece) there are pools of coolant left all over the place, on the engine, in the engine bay and in the plastic undertrays, and they all take a few days to evaporate away.

 

It's been about 4 weeks....

 

That does sound a bit long!
But to get the damage you have on the front trim piece ("splitter") a lot of coolant must have flowed/spilled down the front of the engine, so maybe just maybe there is a lot of coolant still pooled in the front under-tray.
Jack the car up, get underneath, remove that under-tray and check it out.
Not difficult just time consuming due to the number of bolts and screws you need to remove then replace.

 

Aren't the matte-black pieces unpainted plastic? (Our base car's are)

In that instance, failing replacement by the dealer, I'd think that a buff with a Scotchbrite pad would even out the sheen...if not, you would have at least prepared the surface for painting with flexible plastic paint.