Just following up on an old post, but probably some will still benefit from this latest information on "spray on ceramic coatings" from Fireside Coatings USA.
XP 61 is an advanced high emissivity, thin film, spray applied ceramic coating specifically formulated to provide protection of both carbon and stainless steel boiler tubing.
The coating is a high solids system which can be applied to a dry film thickness of 12 to 20 mils (300 to 500 microns) and has no VOC (Volatile Organic Compound) content.
XP61 can be formulated to address specific application needs such as corrosion and erosion resistance, slagging and fouling mitigation and specific thermal management requirements.
XP 61 bonds well to properly prepared carbon steel or stainless steel substrates.
Working properties of the coating exhibit an extended shelf life prior to exposure to air.
Upon curing XP 61 becomes a durable ceramic coating that will provide protection to boiler and furnace tubing and other steel substrates to 1,600° F (871° C) and will withstand thermal cyclic conditions to 1,800° F (982° C)
XP 61 may also be applied as a thermal spray sealer to prevent coating permeation in high temperature environments.
https://firesidecoatings.com/ceramic-coatings/xp-61/