but you can never be sure. When I asked about sandblasting my boat last year they told me I had to remove the tank completely, 'cause there obviously might still be fumes.

Is your tank welded in? Mine's riveted so wasn't a drama to remove it (although didn't get it blasted...had to remove tank to completely drain the fuel due to motor/fuel requirement change).

You will find most will ask for it to be removed.
You might find someone to do it but they will tell you its at your risk(insurance????)
Ive had to remove mine several times but at least the boat was still in one piece to put it back in.lol!

big job to get it out.....

I thought ....like a car you just need to dis-connect the batteries

Petrol fumes are heavier than air and settle in the bottom of the boat, all it needs is a spark to set it off.Most welders require the tank out and the blow an inert gas ,usually nitrogen in to displace any fumes and oxygen so nothing is inflamable is left before starting to weld.
Have seen many photos of boats split open like a sardine can from where they've exploded

well the boat didnt blow up....just a few bucks to fill the tank with CO2

no air......no bang

now have a leccy mount on the tub

Anyone know a good sparkie??????? cash job

What do you want to wire up

have to rig up 2x 12v into 24v

then rig up some sort of charging loom so I dont have to climb around under the transom connecting up ali clips every time I have to charge them up