I must try out soda ash Thu the in laws sand blaster I got at work in 2,5,8,10,25 kg bag so it cheap if a bag or two breaks
PS farm and rural supply sell it for calf as a supplement for about $15/$20 for twenty five kgs
Bruce
yes you cab get a paint that stick to glass but it will etch the glass to hold on to it Try your local paint shop and look for tile paint. I not sure on the colours that you can get
Regrads
Bruce