Ross365
Member
- Messages
- 1,761
- Location
- UK
I'm still on the bottom bit of the leaning curve with my grit blaster.
Tonight I cleaned up the kick plate on my loyal and trusty 40 year-old trolley jack. Painted black, it was looking scruffy and beginning to show a bit of rust.
It cleaned up very nicely in my cheapo cabinet using sieved recycled glass at about 80psi. I then wiped it over with a kitchen towel with a good splash of IPA, which didn't seem to pick up very much dust/dirt.
Sprayed it with a can of bright red zinc phosphate primer by Canbrush, which I've used before and I really like. After waiting for that to dry off it a bit, a close look revealed I've got what look to be like little (<1mm diameter) black 'pits', of hardly any depth, which the aerosol doesn't seem to have covered. They are highlighted to some degree by the bright background colour, and it's no great disaster on this job, but on something where appearance was critical, it wouldn't do.
I guess that after 40 years of use these spots impact damage, results of wear and tear, or might even have been in the original steel plate. I've never seen any metallic slag in this glass grit, or I might have thought it could be that. Though the aerosol has put down a good coat of paint generally, I'm really surprised the paint didn't cover these spots !?!
I've not included any pictures; think they would be to small to see clearly. Any suggestions about their origin and whether there are better things to do than wipe down with IPA before spraying? Thanks.
Tonight I cleaned up the kick plate on my loyal and trusty 40 year-old trolley jack. Painted black, it was looking scruffy and beginning to show a bit of rust.
It cleaned up very nicely in my cheapo cabinet using sieved recycled glass at about 80psi. I then wiped it over with a kitchen towel with a good splash of IPA, which didn't seem to pick up very much dust/dirt.
Sprayed it with a can of bright red zinc phosphate primer by Canbrush, which I've used before and I really like. After waiting for that to dry off it a bit, a close look revealed I've got what look to be like little (<1mm diameter) black 'pits', of hardly any depth, which the aerosol doesn't seem to have covered. They are highlighted to some degree by the bright background colour, and it's no great disaster on this job, but on something where appearance was critical, it wouldn't do.
I guess that after 40 years of use these spots impact damage, results of wear and tear, or might even have been in the original steel plate. I've never seen any metallic slag in this glass grit, or I might have thought it could be that. Though the aerosol has put down a good coat of paint generally, I'm really surprised the paint didn't cover these spots !?!
I've not included any pictures; think they would be to small to see clearly. Any suggestions about their origin and whether there are better things to do than wipe down with IPA before spraying? Thanks.