Discussion in 'New Members' started by sonya Joy, Nov 13, 2019.
Getting it powder coated professionally, they did say they can do it in a chrome or a white hmmmm
It has gal on it which is why it has survived .
Ian's ( Tinbits) daughter owns a powder coating business in Caboolture.
The rack will need a light sandblast first to ensure adhesion.
Ian can probably arrange that with some of his Kombi bits.
The new chrome powder coats are pretty realistic.
After a week you wont care which colour it is.
Hey Col, would re galvanising it cause too much distortion ?
I blasted and powder coated mine but the years and trips have taken their toll and I’ve always wondered if re galvanising would have been a better option…
I think the guy said he could blast, zinc something? and then re galvanise which gives a shiny chrome look?
Galvanising requires dipping into molten zinc at about 450 deg.C
This is why I would be concerned about distortion….the rack would have to be immersed pretty quickly to get even expansion, then contraction on cooling….the steel sections aren’t that thick and thin steel distorts with heat……
Powder coating is a completely different process. Piece is usually media blasted to clean the steel, then zinc rich primed, then electrostatically powder coated and bake finished.
Galv. would be my choice if distortion could be ruled out……the rack will be really shiny at first but will weather down to a soft grey patina…….think old corrugated water tank ( without the rusty brown bits ! )
You can't immerse it to quickly as it will cause the zinc (galvanising) to explode, as the change in temperature would be to quick between the rack and the temperature of the gal, people use to gal things where my Dad worked and they use to dunk objects into the tank causing it to explode with molten gal all over them. You need to pre heat the rack or slowly immerse the rack
Whether it will distort to much I'm not sure but it has gone through the process once so it may withstand it twice, and yes it will oxidise over time and look greyish rather quickly.
Is the rack made out of solid square bar or square tubing?! as if it's hollow it would need access for the air to escape the tubing.
Bright zinc is a shiny zinc surface .
Durable. ( Checking how durable)
It looks like the tube is heavy walled so no issues with being hot dipped but I think bright zinc is a cold process.
( The 16mm round ones like Marks are light walled.)
Gal is hot dipped but usually a rougher texture
Ask to see samples of each and check on the actual process and durability. ( And how much care they take )
I have had both done on items but sometimes the workers must be paid in ground nuts
As Wayne has mentioned...
There will likely be small holes already drilled in it as I would say it's been dipped previously after construction.
It will not need blasting for the zinc coating as the original coating will be stripped in a tank first as part of the process.
Shine can be dependent on the smoothness of substrate .
If powder coating.
Just lightly blast the existing coating to prep.
( Too aggressive and it can let ft the gal leaving coarse edges.
An epoxy powder primer then colour coats works best.
Both are durable .
The zinc will dull as Wayne mentioned.
Powder can go over the zinc later if you choose that way then don't like the zinc.
Pretty sure yours are the light walled 16mm racks?
Pay to check with galvaniser.
Being tube might cope?
Car panels don't
Thinking a bright zinc or chromate prep then quality powder coat .
Epoxy primer and full name top coat.
Sometimes powder is compromised by not being bought fully to cure temp.
Shouldn't be a prob on light tube tho.
Checking how durable bright zinc is as single coating in harsh environments.
Powder coat over zinc will give best protection and cover any corrosion defects better.
Drill near each end enclosed tube to allow air to escape and Zinc enter internally.
Got roofracks colour matched to the white on kombi and they look shit hot!
Can't post pic Everytime I try it says file too large? Weird I've posted no probs in the past? Any ideas?
Anyone got tips make the bed comfy sleep on. Vinyl seats? Mattress topper but then storage problem?
TRI fold foam topper.
At least 2".
Get file size under 1mb. Check the file size by a right click on the file & then a left click on properties.
We use a sheep skin underlay. Makes it better than the bed at home.
Wow I've just googled and there is such a thing! Cheers
You didn't believe me ??
I've taken off on my road trip.
Took bus in auto electrician b4 I left. Indicators just stopped one day and battery light came on.
Anyway paid $700, half was for new beaut 2nd battery for fridge to run off. And apparently was only a blown fuse re the indicators.
I'm parked up and plugged bus in with 15 amp cord but power point in bus not working at all?
Thought at least I still got cig lighter to charge phone etc. Plugged cig lighter kettle in worked for 1min then stopped. Now cig lighter doesn't work for anything I plug in.
Im combining my road trip with the cycle for cancer fundraiser and got my mountain bike on board, taken time off work etc so really don't want turn back.
Just wondering if anyone got any ideas... I do have a power jumper kit on board which will charge phone (need it to post my rides each day) and I guess if I drive enough fridge will stay cold.
Hey seeming you awake can you please look at my post.
I guess I need another auto electrician?
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