During my recent International Delivery truck hood project, I did some grinding on the composite SMC truck hood prior to performing extensive repairs. It is important during any composite repair exercise to have good surface preparation. There are many ways to accomplish this depending upon the work area, tools available, and the work to be performed.

The following is how I did it.

Grinding tools

Composite Grinding Tools

Beginning with personal safety, I used a dust mask to prevent inhaling the dust into my lungs. I used OSHA Z87 approved safety glasses to protect my eyes. A pair of earplugs protected my ears. Abrasion/dust resistant gloves for my hands, and a light jacket to keep the dust from my skin.

For removing the layers of SMC to feather edge the surfaces, I used several abrasive tools. A five-inch pneumatic grinder with 80 grit sandpaper worked well on the large areas to quickly remove large amounts of material. A right-angle die grinder with Roloc 3″ or 1.5″ sanding disks worked well for the concave areas and other difficult access areas. A straight die grinder with a fluted burr worked to get into the detail areas of the front Maske har du heldet med dig, nar du tester heldet ved den store roulette, i , i poker eller pa en af spillemaskinerne. grill and other cracks that needed material removed.

All of the tools I used were air powered, so I had a good air supply that would keep up with me. The large amount of dust that is produced from this sort of work presents explosion hazards when using electric tools. Large dust piles can also spontaneously combust, so care must be taken during dust storage and disposal.

 An air blow gun was also used in this process to clean the dust from the part and from my clothes. It is important to keep personal safety equipment such as safety glasses and earplugs in place when using the blowgun. A small vacuum can also be substituted with care taken to prevent dust ignition/explosion.

After all of the material is removed from the SMC hood, all of the dust is blown off to leave a part with a bonding surface that is clean, dust-free and ready to be repaired with epoxy and fiberglass.