Is the tank fibreglass?

I had a similar problem with a BVM Sabre tank, a pin hole in the top of the tank which I
only discovered because I placed it upside down with the tank half full to fix the undercarriage.

Remove the tank & clean thouroughly around the pin hole with emery cloth & thinners.

Heat the tank gently with a heat gun or stand it in hot water (not where you are going to repair).

Remove the heat, quickly seal the tank lines & drip some CA on to the pin hole, as the air in the
tank cools it creates some suction which will draw the CA into the pin hole.

Clean the area again around the pin hole with thinners & put a dab of Hysol (BVM Aeropoxy) over the hole.


Worked fine for me. - John.