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[bollie7]

I've done it (last time at least 20 years ago) using a 50% Caustic soda solution and ammonium nitrate. It worked very well , however it gasses off a lot...

[bollie7]

I used to own both of these. Both Australian Bolwells. Both fibreglass bodies on a steel backbone chassis.
The bright yellow one on the left is...

[bollie7]

I think you might have to supply some more info re the brand and model if you can. Hopefully someone will know. peter