Every paint and manufacture has a different ground coat they require under paint. Glasurit solvent 55 line specifically wants gray, I've seen yellow primer with there single stage 22 line.
I never heard of using dry ice to strip paint but it sounds interesting. So far a mix of chemical stripping and sanding works the best. Sand blasting always leaves a mess and gets in all the places you don't want it.
Sanding 1/4 panels. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
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.
Thank you for taking the time to explain the process in depth. After looking into it a company actually offers this service in our industrial park. Thanks for sharing you learn something new everyday!
Body prepped for paint. Surface cleaned and treated with a anti static wipe that removes the static surface charge to reduce dust. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Rosso corso mixed in Glasurit 55 solvent paint. Image Unavailable, Please Login Image Unavailable, Please Login
Base coat sprayed using a Sata 5000 HVLP gun with 1.2 tip fluid tip. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Glasurit 923-255 clear coat sprayed with a Sata 5000 RP gun with a 1.3 tip. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Body panels sanded for paint. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
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
Prepped for paint. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Glasurit 55 line solvent base coat. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Glasurit 923-255 clear coat. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Doors painted. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Block sanded and sprayed. Black trim paint next. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Interior door scoops sprayed. We used to do this at the same time while painting the exterior but always ended up with nasty drips inside we had to sand out. This method came out perfect. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login