Automotive bondo will not hold in a marine environment...

And fairing a hull is real bull work with endless hours spent pushing a
fairing board back and forth...  I estimate that a 35 foot hull that
has welding ridges will need close to 1000 man hours to be fair...  You have a
real project on your hands...

Simply call the steel boat builders, like Real Ships, etc. and ask what they
use to fair their hulls... It won't be cheap because quality materials cost
money - but redoing a job that failed due to cheap materials costs lots
more...

denny / k8do

This is a topic which has such expensive implications that it is not
practical to spoon feed someone the excruciating details of how to go
about it.

As Dennis points out the amount of labor is enormous, done wrong is a
total waste of time. The best choice of materials and technique is in a
constant state of flux and the material choices change over time.

The hull should be examined carefully for any mistakes in construction
techniques that should be corrected before the fairing and painting work
is done. None of this is simple.

Anyone who plans to do this sort of thing needs several books on the
subject and to consult the manufacturers of the materials that you plan
to use. At which point some of the people who lurk on this list may be
able to provide some minimal coaching on specific problems.

Almost regardless of how careful your research and planning the chances
of getting everything right, if you are doing this for the first time is
not high. The cost in time and money to redo can easily result in a
failed project. I have seen a lot of these failed projects.

Mike

Capt. Mike Maurice
Tigard Oregon(Near Portland)