Have it sandblasted. Remove it if needed. this way you will have all the
loose material gone and the cleanest possible surface to work with. You can
be satisfied your fillers and paints adhere properly with this method.

A needle gun with a compressor would be my 2nd choice. These are great for
removing lumps of rust. Though , you would still need to use a grinder and
wire brush with this method.

DP

"Arturo Ui" wrote in message
oups.com...
I've a cast iron keel that has been rusting quietly under my boat for
the last few years. Most of the antifouling paint on the keel is on
rusty 'scabs'.

What is the best way of removing the paint and 'scabs' from the keel?
Ways I've considered so far include a circular sanding device (in an
electric drill) and an angle grinder.

Does anyone removed this type of rust before? What is the best way of
removing it that doesn't take forever and cost a fortune in abrasive
discs? Does on the those 'paint removers' with the spring steel tines
work OK or do they just take off the rust?

Many thanks

Artie