Hard to imagine that you can get the slide hot enough to damage any quality firearms coating.
H-Series is the most durable of the standard Cerakote family of coatings and provides the best performance in hardness, wear and scratch resistance, adhesion and rust resistance. It can withstand heat up to 500f – 600f degrees and comes in the widest range of colors.
Cerakote™ C-Series: For high-temp applications up to 1700°, such as suppressors and machinegun barrels, Cerakote™ C-Series has no equal. It's available in a wide range of colors to match the overall finish requirement of the firearm or weapons system.
Your finger (and wallet) are going to wear out long before you can do enough mag dumps to ever get it hot enough to damage the finish.
FFL Type 07
"I have learned that wisdom can be as simple as substituting facts for assumptions."