Which grade of aliminium oxide for blasting minor bodywork??

[damian1978]

Hello all, I'm planning to do some shot blasting on my minor prior to repainting - areas such as doors, underside etc and I'm wondering which grade of grit would be best to leave a surface ready for priming.

I've seen some aliminium oxide 60-80 grit and 120 grit priced quite reasonably but I'm wondering which would be more suitable for the finish I'm hoping for.

Any advice/comments welcome!

Thanks
Damian

[bmcecosse]

Knotted wire brush in angle grinder I think !

[damian1978]

I think shot blasting is a quicker and more thorough way! I've got a knotted wire brush on the grinder but wouldn't fancy doing a large area with it. I did the underside of an old vauxhal cavalier with it a few years ago - never again!

[bmcecosse]

You have a point - but the grit will go everywhere - and it's not inexpensive. Take great care to seal up the engine before starting the blasting.

[alanworland]

I dont know what grade grit I used but it was probably the 60 or 80, but as bmc says, be prepared for a big mess! Bits like doors I did down the garden, I wore boiler suite with rubber band round the neck, goggles, hat and I would suggest ear plugs - then your set!
My shot blaster has a variety of rubber 'noses' to catch and recycl the shot (well, some of it) for doing awkward areas like inside corners etc.
Excellent method of rust removal - have fun!

[rich-legg]

Walnut shells are the best for blasting body work.
Be careful with the wire brush attachment, is can buckle/warp panels if you don't do it correctly.

[paulhumphries]

Try an abrasives specialist. They type of place businesses get wet & dry, sandpaper, grinding wheels etc.
I buy recycled grit for my blasting cabinet that is actually worn out bench grinder wheels and such that are crushed and graded. Fraction of the price of "virgin" grit and works just as well.

Paul H