Bradan F355 bare metal paint job, Upholstery, mechanical service

Dan, this is the theory of how CO2 blasting works.

I have no idea how expensive this equipment is but I think it can also be rented.
And I don't sell this stuff.
The best piece is that there is no wet gloppy paint/stripper to dispose of. Only the paint residue because the CO2 sublimes away.

CO2 blasting works because of three primary factors: pellet kinetic energy, thermal shock effect and thermal-kinetic effect. Cold Jet optimizes blast performance for each application by combining these forces and adjusting:

• compressed air pressure
• blast nozzle type (velocity distribution)
• CO2 pellet size and density
• pellet mass rate and flux density (particles per unit area per second)

Pellet Kinetic Energy
The Cold Jet process incorporates high velocity (supersonic) nozzles for surface preparation and coating removal applications. Since kinetic impact force is a product of the pellet mass and velocity over time, the Cold Jet delivery system achieves the greatest impact force possible from a solid CO2 pellet by propelling the pellets to the highest velocities attainable in the blasting industry.

Even at high impact velocities and direct head-on impact angles, the kinetic effect of solid CO2 pellets is minimal when compared to other media (grit, sand, PMB). This is due to the relative softness of a solid CO2, which is not as dense and hard, as other projectile media. Also, the pellet changes phase from a solid to a gas almost instantaneously upon impact, which effectively provides an almost nonexistent coefficient of restitution in the impact equation. Very little impact energy is transferred into the coating or substrate, so the Cold Jet blasting process is considered to be nonabrasive.

Thermal Shock Effect
Instantaneous sublimation (phase change from solid to gas) of CO2 pellet upon impact absorbs maximum heat from the very thin top layer of surface coating or contaminant. Maximum heat is absorbed due to latent heat of sublimation.

The very rapid transfer of heat into the pellet from the coating top layer creates an extremely large temperature differential between successive micro-layers within the coating. This sharp thermal gradient produces localized high shear stresses between the micro-layers. The shear stresses produced are also dependent upon the coating thermal conductivity and thermal coefficient of expansion / contraction, as well as the thermal mass of the underlying substrate. The high shear produced over a very brief expanse of time causes rapid micro-crack propagation between the layers leading to contamination and/or coating final bond failure at the surface of the substrate.

Thermal-Kinetic Effect
The combined impact energy dissipation and extremely rapid heat transfer between the pellet and the surface cause instantaneous sublimation of the solid CO2 into gas. The gas expands to nearly 800 times the volume of the pellet in a few milliseconds in what is effectively a "Micro-explosion" at the point of impact.

The "Micro-explosion," as the pellet changes to gas, is further enhanced for lifting thermally-fractured coating particles from the substrate. This is because of the pellet's lack of rebound energy, which tends to distribute its mass along the surface during the impact. The CO2 gas expands outward along the surface and its resulting "explosion shock front" effectively provides an area of high pressure focused between the surface and the thermally fractured coating particles. This results in a very efficient lifting force to carry the particles away from the surface.

 

Dry ice blasting is used on everything from restoring historical documents/manuscripts to removing automotive paint and smoke damage from buildings that were on fire. Obviously depends on how hard you want it to take stuff off, but pretty cool stuff.

 

love it.

 

All that..... for red.



Robb

 

Absolutely amazing work, and really appreciate you sharing the step-by-step detail with us!

 

Wow.

 

Dry ice blastingwill likely cost you about 4000 just for the ice.
Many companies that sell the ice will rent the machine cheap like 500 a week.
It will take about 5 days labour to blast it based on my experience with 2 people. One will be feeding the machine and one blasting.
Works very good but not allways cost effective.
You would need to do the math on your method

 

Love these updates on this extensive resto!