can i use this on my brake calipers

Yes. I've used it on my brake calipers and it works great. Depending on how much you drive you may have to touch it up to keep it bright every so often but that's going to happen regardless of what paint you use because brake dust, etc. I use this because its high temperature.

Is it OK to use a gray primer and then use a hot pink paint over top of the gray

Primer of any kind will be good for a nice finish for whatever you are painting. I recommend 3 light coats of primer lightly sanded in between. When getting ready to apply you engine paint, beware, this is thick paint. It has heavy particulate matter which is the paint. I recommend that you turn the paint can upside down for 3 to 4 hours. This paint settles heavily. After several hours upside down, shake violently to get it mixed well. After that don't spray too close to your target surface. Do not spray at any temp less than 72 degrees fahrenheit, and spray evenly side to side about 5 to 6 inches, from surface.

Has anyone had luck with the VHT clear coat enamel? Does it last and resist chemicals?

Hey Josh, Pretty much like any other Clear Coat. It does work. Should re spray a couple of coats. It will last for awhile,depending how it's used!! Hope this helps! {wolfman}

ASIN	B000CPAV8Y
Age Range Description	Adult
Amazon Bestseller	#1,064,705 in DIY, Tools & Garden ( See Top 100 in DIY, Tools & Garden ) #3,597 in Spray Paint
Brand	VHT
Brand Name	VHT
Color	gray (light gray)
Color Code	#D3D3D3
Container Type	Can
Coverage	Partial
Customer Reviews	4.7 out of 5 stars 577 Your Review
Dry Time In Hours	1
Finish Type	Matte
Full Cure Time	1 Hours
Global Trade Identification Number	00010155001487
Included Components	VHT SP148 ENGINE ENAMEL LIGHT GRAY PRIME
Indoor Outdoor Usage	Outdoor
Is Waterproof	True
Item Form	Aerosol
Item Type Name	VHT SP148 Engine Enamel Light Grey Primer Can - 11 oz
Item Volume	11 Fluid Ounces
Item Weight	330 Grams
Manufacturer	VHT Paints
Model Name	AXCSP148
Paint Type	Enamel
Size	11 Ounce (Pack of 1)
Special Feature	使用されていません
Special Features	使用されていません
Specific Uses For Product	Engine
Surface Recommendation	Metal
UPC	010155001487
Water Resistance Level	Water Resistant

VHT SP148 550° エンジン エナメル 高熱スプレー ペイント プライマー – ライトグレー グロス – 11オンス エアゾール缶

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VHT SP148 550° エンジンエナメル高熱スプレーペイントプライマー – ライトグレーグロス – 11オンスエアゾール缶