Shot blasting

Shot blasting

Author
Discussion

calum62

Original Poster:

84 posts

41 months

Monday 1st February 2021
quotequote all
Hoping to have my Taimar chassis fully stripped this week and ready for shot blasting.

I've never had any blasting done before and I'm wondering:

1. Roughly how much I can expect to pay
2. How to pick a decent firm - what questions to ask (Based near Aberdeen)
3. Anything to be wary of

I'm going to have to do some welding after it's been blasted. I was planning on painting the parts of the chassis that dont need welded with epoxy primer soon as I get it back from blasting and then do the required welding and finish off the priming after.

If you've been there and done it I would appreciate advice

Cheers
Rob

GAjon

3,721 posts

212 months

Monday 1st February 2021
quotequote all
Long time since I worked in Aberdeen, but there’s got to be plenty of shot blasting and finishing specialists in the area with the offshore industry.

I had my last chassis blasted, did the repairs then had it re blasted and coated.

If I were doing it as you are proposing, and painting it myself, I’d try and find a place that can blast it and coat it with a weldable primer.

No idea of costs for your area.

Classic Chim

12,424 posts

148 months

Monday 1st February 2021
quotequote all
Avoid blasting it until you are ready to paint it. Just grind back powder coat where you want to weld. It will start oxidising very quickly if left bare. I was led to believe primer also attracts moisture but happy to be corrected.

TwinKam

2,936 posts

94 months

Tuesday 2nd February 2021
quotequote all
Just had mine blasted prior to repairs by Southways. Rich explained that an initial blasting is required to expose weak areas that haven't yet perforated, otherwise you live in a fool's paradise. He didn't want it primed as it's an unnecessary expense.
After welding it will be blasted again immediately before the coating processes.
I had quotes ranging from £200 to £400 (S. Coast)
Horrible task, I was very happy to pay someone else to do it!

Classic Chim

12,424 posts

148 months

Tuesday 2nd February 2021
quotequote all
TwinKam said:
Just had mine blasted prior to repairs by Southways. Rich explained that an initial blasting is required to expose weak areas that haven't yet perforated, otherwise you live in a fool's paradise. He didn't want it primed as it's an unnecessary expense.
After welding it will be blasted again immediately before the coating processes.
I had quotes ranging from £200 to £400 (S. Coast)
Horrible task, I was very happy to pay someone else to do it!
Fools Paradise,, really. You’d be some numpty to mis steel that’s so corroded as to perforate simply by sand blasting, I’ve not known anything that rots from the inside but if we are talking very old chassis fair enough as there may be hairline cracks in welds etc.

Edited by Classic Chim on Tuesday 2nd February 06:08

anonymous-user

53 months

Tuesday 2nd February 2021
quotequote all
https://www.theegroup.co.uk/eblast
are probably the best. Don’t know what they’re like price wise or if the do work outside of the oil and gas industry, but worth a phone.

TwinKam

2,936 posts

94 months

Tuesday 2nd February 2021
quotequote all
Classic Chim said:
TwinKam said:
Just had mine blasted prior to repairs by Southways. Rich explained that an initial blasting is required to expose weak areas that haven't yet perforated, otherwise you live in a fool's paradise. He didn't want it primed as it's an unnecessary expense.
After welding it will be blasted again immediately before the coating processes.
I had quotes ranging from £200 to £400 (S. Coast)
Horrible task, I was very happy to pay someone else to do it!
Fools Paradise,, really. You’d be some numpty to mis steel that’s so corroded as to perforate simply by sand blasting, I’ve not known anything that rots from the inside but if we are talking very old chassis fair enough as there may be hairline cracks in welds etc.

Edited by Classic Chim on Tuesday 2nd February 06:08
OK, to put it another way, if it survives a 'brisk' blasting, it stays. Is that better? tongue out

plasticpig1972

202 posts

45 months

Tuesday 2nd February 2021
quotequote all
I have never done this job on a TVR but when you see stories about Outriggers imho it's best to replace anyway. I would also do that with Stainless Outriggers.
For sure personal choice of course.
I have changed the Chassis on two different Lotus Elan +2s and each time it was a no brainer Lotus Galvanised.
So many choices but you only want to do it once and do a 100% job.
Alan

calum62

Original Poster:

84 posts

41 months

Tuesday 2nd February 2021
quotequote all
GAjon said:
Long time since I worked in Aberdeen, but there’s got to be plenty of shot blasting and finishing specialists in the area with the offshore industry.

I had my last chassis blasted, did the repairs then had it re blasted and coated.

If I were doing it as you are proposing, and painting it myself, I’d try and find a place that can blast it and coat it with a weldable primer.

No idea of costs for your area.
Cheers - Will need to have a discussion with the blasters to see what they can do and what they recommend

calum62

Original Poster:

84 posts

41 months

Tuesday 2nd February 2021
quotequote all
TwinKam said:
Just had mine blasted prior to repairs by Southways. Rich explained that an initial blasting is required to expose weak areas that haven't yet perforated, otherwise you live in a fool's paradise. He didn't want it primed as it's an unnecessary expense.
After welding it will be blasted again immediately before the coating processes.
I had quotes ranging from £200 to £400 (S. Coast)
Horrible task, I was very happy to pay someone else to do it!
This is what I understood as well. Difficult to tell just by looking at it what is fairly rusty metal that could be okay when cleaned up and what would end up looking like a lace curtain when blasted. My out riggers being a good example, well rusted in appearance no trace of paint but I can jump up and down on them and hit them with a hammer and no holes. Will need to take before and after photies of the outriggers.

£200-400 sounds doable. Looks like a nightmare job due to the chassis construction.



calum62

Original Poster:

84 posts

41 months

Tuesday 2nd February 2021
quotequote all
Classic Chim said:
Avoid blasting it until you are ready to paint it. Just grind back powder coat where you want to weld. It will start oxidising very quickly if left bare. I was led to believe primer also attracts moisture but happy to be corrected.
No powder coat, it was painted and most of that is gone excepting the back bone chassis in the transmission tunnel.

Planning to use Jotamastic epoxy mastic paint (few coats on clean blasted metal) Not sure yet if I will have a zinc rich primer as the base coat and then epoxy mastic on top. Was toying with the idea of a layer of stone chip on the most exposed areas. A ways off needing to decide yet biggrin

This is typical of my outriggers - I am anticipating after blasting they'll have a load of holes in them