has anyone on here blasted the underside of there camper? i have the equiptment to do it but ive never done it before and im unsure what is the best media to use? i only have a suction fed shot gun so no hopper so im not sure what is best to use with this? sand, glass beads, walnut shells ............... i want to strip the underside back to bare metal before etc primer to make sure ive removed and repaired any rust. any help it very welcome
If you don't have a hopper Glass might be your best bet. not used sand before. I have heard that kiln sand is harmful after it has been blasted due to releasing nasty dust, not sure if any other sand is better. Will find out for you
my concern is always that blasting fills cavities up with blast media that then cannot be removed and acts as a water trap. It gets everywhere, it'll fill the chassis legs and find it's way into the steps, pillars,arches etc. hatefull job that it is, I'd scrap all the underseal off then use wire bushes on angle grinders/drills etc to get at bits of rust. then paint and waxoyl.
Soda environmentally friendly, doesn't retain water if it gets into your panels, plus it dissolves away with water!! http://www.ebay.co.uk/itm/360302919418?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649#ht_2450wt_1166
Hiya, couple of things to bear in mind: 1. Media blasting needs a lot of air - I use a 20 gallon pot and have a 200l 14cfm compressor and it wont keep up if I use it all the time, so tend to do 5 mins on 5 mins off, its not that the comp takes 5 mins to re-fill but you have to be aware of the duty cycle on the compressor if you are trying to run flat out. A lot of the guys who do this regularly by an old road mending compressor - the diesel things you see towed behind Transit vans! 2. Media choice is important - NEVER use sand of any type, it is banned under HSE regulations and will give you Silicosis (look it up). - Soda is good especially for bodywork as it doesn't generate much heat and will not damage rubber/glass etc. It is a one shot media though i.e. can't re-use and is very fussy about moisture (it clogs) so ideally your air supply needs to be pretty dry and clean. It has the advantage of dissolving in water, so clean up is really easy. I also use soda for cleaning engine parts as it washes out and won't leave grit inside your valuable motor! - Metal/grit such as "Supafine" is the favourite for heavy duty cleaning. It is pretty abrasive and is re-usable - it will develop heat and can blow through thin metal, so whilst I would use it on chassis i would be very careful on body panels. - Other media such as glass, walnut shells are available but i haven't used them,TBH soda and supafine cover my needs. 3. If you use an agressive media like supafine you will blow through nozzles in no time, so invest in something like this http://www.ebay.co.uk/itm/SAND-BLASTING-NOZZLE-2-5mmTUNGSTEN-CARBIDE-sandblastin-/320829543890?pt=UK_Air_Tools_and_Compressors&hash=item4ab2ee55d2 4. Sorry, but you will need the patience of Job to do a chassis with a suction gun - it will take forever If you are looking at Soda have a look at these guys, http://www.millarsodablasting.com I bought a £90 pot of e-bay and then his conversion kit so I had soda and ordinary for the same price. I am doing similar to what Brother suggested, scraping and cleaning first, but then I will use media for getting at the bits i can't clean effectively by hand - have a look at my resto thread if you like, linky down below HTH, MM
i don't dude... but I suck that one up as I'm in the borders!! By time I take fuel and time into account, then that £10 delivery works out pretty cheap
