Here we are again!
As we promised before, in this article we will try to clarify your ideas about the different methods to prepare your car shell in the best way before starting its restoration. In this article we will mention what are the best treatments for the paint removal in our opinion. After writing about the pyrolitic hot air paint removal, we will write about the sandblasting, one of the best known methods.
The compressed air sandblasting method consists in effusing abrasive particles(quartz,corundum,silica, sand) through a "pistol". These particles, thanks to the generated pressure can have an abrasive action on the to be handled area. The "sand effect" breaks/crumbles the paint particles creating a very thin powder which is extremely dangerous for man.
Advantages And Disadvantages
The advantage of this treatment is the possibilitty of treating only a part of the car shell (eg. inner bonnet/ just the bottom etc). and it is quite cheap.
The application of this treatment requires a lot of technique and attention, because in the specific case concerning the car shell, by the thin sheet iron (6/7 tenths) there is a high deformation risk. This is due to the temperature increase of the treated part and it is mainly caused by the grit friction, but above all by the "different temperature persisting during the process". eg. the treated area is always circumscribed (a little car shell portion), so a different "thermic condition" generates, so that it can cause the sheet irons' ondulation. This lithe aspect is impossible to correct if not with the removal (and consequent substitution) of the damaged area.
One limit of the sandblasting treatment is the incomplete paint shell removal from: embossed sheet irons, interstices and car boxes interiors. These points are not reachable by the sandblasting ejection, so they will remain dirty and oxidised...with a consequent continuing oxidation process .
Another aspect not to be underestimated is the standing sand residual inside the car shell. The sand which has been used for the treatment can infiltrate anywhere: inside the car boxes, in the corners and interstices. Though an accurate cleaning through air blowing/ shell rotation movement, the risk of a life lasting sand presence is more and more concrete.
If you want to get some more information about the above mentioned processes, or in case you need our specific consultancy to start your vintage car restoration, do not hesitate a contact us directly!