I recently ran across this product on Ebay, cannot attest to its quality or color-match, maybe others here have used it? They claim to have color matches for most appliance and plumbing fixture manufacturers - I did find the GE Turquoise one.
"Porcelain repair" kits are paint, folks. And if paint would hold up to stovetop use, range manufacturers would love to use it, because it's way cheaper than the genuine porcelain they're forced to use.
Not saying it won't make things look better for a while, but color changes and peeling are a-comin' soon.