Is it in or out of the boat? I would reccommend having it professionally cleaned before doing any cutting on it, as we have had a few ignite when welding on them. They build up a varnish layer and trap fuel in the pockets.
There is a device available called a 'nibbler' which is used
in various sizes for cutting odd holes in sheet metal. The one
I am thinking of for your purpose is hand operated, much like
a pair of pliers. This device can be started at an edge or,
in your case a hole about 3/8" diameter, and by working the
handles it will cut little bits of material producing a slot
or kerf about 1/8" wide. You work it along the line of cut
and can create openings. I have used these in mild steel sheet
up to about .04" thick. I don't know how thick your tank material
is but there are power nibblers that essentially do the same
thing that will cut heavier materials.
None of these devices/methods produce heat or sparks and
would be safe to use in your tank.
I would recommend contacting a metal fabricator in your boatyard
or elsewhere as they know about these devices and can either
come do the job or perhaps rent the tool to you.
1983 Bayliner 2260 Trophy
Puget Sound, Washington State
Our "belly" tank is leaking (diesel)..would like to repair it without removing it from the boat (very difficult)..have been told that their is resin that can be poured into the tank that will seal it..is anyone familiar with this??
I've cut two additional 6x6 holes to get to the divided compartments, cleaned all the crud out and now ready for the supper cleaning and then applying the expoxy coating. Will let you know how that goes.
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