Hi Andrew, my optimistic thought was shattered tonight a little, as when I tested the electroncis later on the tanks chucked it. To such an extent that the board wouldnt even power up.
I have removed the TAE board, and have dried it out and used a non oil based de-watering solution we use for PCB's at work. The tanks seem to be working ok, I never used the origional brakets supplied, I made a slider for the rear bracket, the one thats impossible to reach, and an "L" bracket for the frount which can be slid upwards to be removed, and just a cable tie to secure it in place, a belt and braces approach.
I left it on the fire surround tonight and its working again thank god ! But I am still going to be doing a lot of repeated bench tests before it goes near the water again I know that.
On the subject of the bearings for the motors, you are right its the brass tubes that gave way. I also used twin pack, Devcon I think. But it turns out after a little digging on here tonight that these twin packs can be prone to loosening with vibration. Something I didnt know previous.
I have solved it I hope, by using a run of Milliput round the bearings, and sealed it with resin, just to incase it. Hopefully that will seal it.
and thanks Mankster for the advice on the bolts. I think I will add a few anyway, but if the tension of the bolts is that crucial, I may use my torque wrench and see what setting they have to be to make a seal. especially if I am going to use a Neoprene sheet.
I know one thing, any exuberance or impatience to get it in the water has gone, that was he last chance I am going to take with it !
Funny, I would have never thought in a million years a bearing like that would come loose, never mind 2 within 20 minutes !
Paul