Sandblasting

[inspiration]

I noticed the B&Q were selling a sandblasting attachment for the karcher pressure washers for £45. Has anyone used one of these on a grp hull ?

Are they any use as they say that it is strong enough to strip rust from steel so i presume it will take antifouling from my keel.

what should i watch out for if i use it to take the old anti-fouling off the hull or the paint from the topsides?

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[ongolo]

You will have to watch for flash rust forming almost immediately. This can be overcome by certain additives or by aplying a water based paint immediately whilst the steel or cast iron is still wet. A water based paint will "soak up" any remaining moisture.

As an additive we use phosclean which is phosphoric acid with a neutralsing agent in it. You could make your own concoction using diluted very weak phosphoric acid and dishwashing liquid. Outcome uncertain.

One water based paint over the bare steel could be durhams water based epoxy designed actually to seal cement dams, given about 7 days curing time, you could put epoxy tar on the keel over the water based epoxy.

Accquaintance of mine has done that on a 45? Roberts Spray.

How good said blaster is I could not say, but it will probably work if your pressure is high enough.

Hope it helps.

regards ongolo


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[jimbouy]

Damn I was going to ask the same thing this morning.

Anyone else used their Karcher???

<hr width=100% size=1> "It is a pleasure to give advice, humiliating to need it, normal to ignore it"

 

[Talbot]

I have seen someone trying to use one of these on their antifouling, and they went back to using a scraper! I would expect that there effectiveness would depend on the power of the washer. What does work much better is a sandblaster attachment to a air compressor - see here for the attachment <A target="_blank" HREF=http://www.compressormart.com/>http://www.compressormart.com/</A>. You should be able to hire the compressor (get at least a 2kw preferably 3kw) and use dry silver sand

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[david_bagshaw]

and probably get thrown out of the boat yard !!!!


The dust made by dry blasting is unbelieveable.

<hr width=100% size=1>David
<A target="_blank" HREF=http://www.euroboating.net>http://www.euroboating.net</A>

 

[Freebee]

I have used one, you need very very dry sand and quite alot of it, but remember like pressure washing you are only going to redistibute what you blast off, any other boats or cars in the vicinity are going to get covered and possibly damaged. not used one on grp but I imagine you could go thru the gel coat very easily.

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[Althorne]

I would recommend against any shotblasting yourself for several reasons not least the health hazards to you and everyone else locally. I had a shotblasting business for many years before retiring and can assure you that the 'toy' ones sold are pretty useless, completely underpowered for the purpose they are supposed to be used for and usually do a lot more damage than people realise until too late.
Good luck.

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