We hear a lot of stories and tales from clients that have experienced poor service or damage to body panels rendering some to the point of no return. Here at Maldon Shot blasting we use the correct tools & media for the job in hand, there is little or no point by using high pressure blasting to hurry the work along and the wrong materials as this will lead to a poor and damaged job. If we find that a body panel is to delicate as some bonnets and door skins tend to be we will not blast them other than around the edges and award to clean areas.
An example of our poor Shotblasting Chassis Work:
This according to the body shop this Porsche Body Chassis had been rebuilt and fully repaired by another resto company, however after blast cleaning the bodge work was only to apparent!..
Residue of soda are the biggest concerns for car restorers . Yes soda can and will cause problems as it reacts with powder and wet paints should there be any left behind after cleaning, The text book way of removing Soda is to use a mild acid base product (normally white vinegar diluted with tap water), however the last thing you want to do is to wipe down a raw body shell with this mixture.
Other problems with soda, it is not effective for removing deep seating rust and being the very thing that needs to be removed, It wont remove stubborn sealants, under seal or glue.
Successful car media blasting comes down to five basic principles:
1. Selecting the Correct Type of Media
There are many media types available. Some are good for blasting body panels, but most are not. Each of these media types have a different hardness and will react with metal differently including: causing heat and actually embedding in the metal. For this reason we use crushed glass or glass bead. After much research and many trials, prefer the excellent results that crushed glass provides Our fine crushed glass is the approximate grain size of table salt.
2. Blasting PSI.
Most sandblasters will blast with a large compressor and blast at 125+ PSI. This will strip metal very fast. However, this creates heat and is very aggressive on the surface of the metal and will actually remove metal. We blast our crushed glass or glass bead at a very low 45-65 PSI depending upon the surface we are blasting. Furthermore our blast pots have pressure and media control systems
3. Blasting Tip Size
Some Blasters will blast with a large nozzle so to deliver a greater amount of media to the surface making the job faster . We blast with a 3/16 (#3) or 1/4″ (#4) tip. Smaller tip means more media control and less media hitting the metal at once. Which translates to less pressure on the metal.
Blasting a car body is not about how quickly it can be done. Using a #8 tip, blasting at 150 PSI, will clean an entire car body very quickly. We have even heard competitive estimates as low as 3 hours to blast a whole car minus bottom …But believe me, you will cry at the results and all of the body damage! Using the correct techniques , it normally takes 6 to 8 hours to do a smaller shell to up to 15 hours for a complete larger car (outside, inside, bottom and doors).
5. Blaster Technique / Experience
The moral of the story, blasting a car body correctly takes the right equipment, time and experience to do the job right.
Our new blast facility measures 14 mtrs x 4 mtrs so we can accommodate large cars and classic ca,per vans. (sorry no commercial lorries)
Sand blasting has been illegal for many years. Some still use sand as it is a cheap alternative.
Blasting Aluminium body shells requires extra care , time and fine glass bead.
Protection of a raw body shell is paramount, we can offer several alternatives from standard primer coat’s to clear & tinted phosphate coats.
For examples of our work please pay a visit to our face book page or our web site:
Some examples of our recent Shotblasting Chassis Work:
Blast cleaning will strip your car, parts or panels clean of paint, rust, grease, body filler and other unwanted contaminants or paint materials.
Using the latest in blast media technology to ensure the best finish on your car and it’s component parts .
We utilise four different methods to ensure the best finish for your car, it’s the extra time and effort that we put in that ensures your car the superior result. Spending anywhere between ten to twenty hours on a body shell ensuring a high quality finish.
Bead blasting, Crushed glass, fine garnet or Plastic.
Our Labour costs are comparable with others in the trade, however bearing in mind we do not use aggressive cheaper materials that can and will damage the substrate, cause panel wrapping and leaving the panel work with a rough and unsatisfactory finish, keeping this mind the extra costs involved is to cover the high grade materials we utilise with the extra time and care we take on your car, that will ultimately may save you thousands of of pounds on unnecessary repairs that can be caused by careless l blasting.
Controlled blasting and the correct media is essential to a good end results, by regulating the head pressure and delivery of material to the surface so not to damage the parts being blasted.
Good preparation is paramount to a good long lasting finish.
Once the cleaning is complete we offer several options to protect the surface during the restoration period.
Epoxy primer, clear green tint or black phosphate coats, two pack primer. We will recommend the correct product to use at the time of when the work starts.
The term sandblasting is incorrect the to use, using sand is now and has been for sometime against E.U health & safety law.
Why does it need blast cleaning?
In short it removes all contaminants such as rust, old paint and gives a good canvas and key to start the powder or painting process and at the same time it normally reveals any problems such as corrosion weakness or broken weld joints.
Soda blasting is a very long and fairly expensive alternative, but also has disadvantage, this process is not effective in removing rust, under seal or some paints . It has it’s place in this type of work but we prefer to offer a plastic media over soda.
Acid dipping is NOT recommended by us.
A common and very effective way of stripping paint and coatings from ferrous and non-ferrous components is acid or caustic dipping.
Although recognised as an inexpensive way of conducting this process, stripping of items such as a car body can give rise to numerous and negative effects.
The use of these aggressive chemical strippers can, for example, leave residual chemicals entrapped in the frames, joints and structure of a car, vehicle body or panel.
Additionally the inside of the vehicle body and panel will have been paint dipped by the manufacturer and this will then be removed by the acid/caustic stripper and cannot be replaced, leaving the inside of the body shell/panel open to possible corrosion from within.
Leaching out from seams and hidden sections over a period of time could ruin the paintwork.
Costs are subject to the condition and what we find during the process.
On average the costs of blast cleaning a body shell can be between £600 to £120000 & a further £150.00 to £300.00 for primer work.