How much is not cheap? (in $$$ please)

That soda blasting machine looks great.

it all depends on where you live, I see that your in Queensland there is a place there that sell a brand called Natruim 260 for about $60 a bag ( 25 Kg ) I am located in SA so my option are limited to brands called AMREX which is $96 - $120 per bag depending on the grade you get ( retail price ) and Bump soda Which is made in NSW and is about $80 a bag. Its cheaper to buy it by the tone,which is 40 odd bags and that ranges from $1500 to $2500 depending on the brand again.. these are all walk in off the street prices... The stuff i use is from a local blaster... i just buy a few bags off him at a time and give him a little extra cash for helping me out.. its not a cheap blasting media.. that same company make a abrasive blaster which can take garnet,glass beads etc for $500 and they said to me that its just as good as the model i brought.. Which works great.. Will be looking into buying that machine later down the track..

There is a pic of the blaster guys !!

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got the inside all back to bare metal today, Cleaned then Acid etched it ready for rust sealing next weekend!!

few pics

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few more

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this is the best prep ever, so good

Looks like its been through an acid bath.

So clean! Good work

Sure has, Its a water based rust blast, Leaves a zinc phosphate coating - pre-priming etcher. It also dissolves rust, depending on how bad the rust is. More rust longer you leave it on there without letting it dry on the surface !!!

Also great if you are not going to paint the bare metal straight away, i have left it like that on other parts for up to 30 days and still no surface rust... really good product...