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Thread: Painting metal flake
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10th Apr 2020, 05:58 PM #16Golden Member
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Full day on BMX today but not really much to show for it. Step 1 was to finish getting all the parts ready for paint, this included lots of time on the bench grinder with a brass wheel, getting the brake mechanism stripped. I suspect they are powder coated but I got them completely stripped.
The pain was the frame. Whilst the stripper worked it didn’t do enough to get it ready for paint. So plenty of time with a brass wheel on my impact driver plus some sandpaper and I had it down to this:
I used 80 grit to clean it up, so used some 180 and 240 to try and clean up the sanding marks. I believe the metal flake hides a lot of sins so was going to go ahead with how I have it now.
Next up I built my spray booth. Last time I did it I tried to make a positive pressure booth but it didn’t really work because my fan wasn’t strong enough, so this time I build the frame and closed it in on all sides but 1.
Everything else in the shed is covered for overspray protection, but I’ll keep the paint rate low as I only have tiny pieces.
All hung in preparation for primer. Still need to clean them with wax & grease remover.
Tomorrow the plan is primer, white for the parts hanging and depending on how that goes, maybe some sanding and/or laying some purple metallic.
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11th Apr 2020, 09:11 AM #17
Thats some booth ideal tho. Plenty light to see whats going where is needed.
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11th Apr 2020, 09:19 AM #18
Bit late now but as a kid I wanted to paint my 26”.
So my dad (who was a fitter and turner ) gave me a broken piece of hacksaw blade with the teeth ground off to scrape the old paint off with.
It took me forever, but compared to sanding which was endless by hand it was the way to do it.
H.Jimcracks for the rich and/or wealthy. (aka GKB '88)
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11th Apr 2020, 09:22 AM #19Golden Member
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Turns out I can’t lay the purple without putting clear on top. As I’m still waiting for the metal flake this poses a question. Do I clear now and rub it for the flake or wait till I have the flake?
A light coat of clear would protect the metallic if I get the flake wrong but my head is thinking I just leave them in primer for now and focus on finishing the white parts instead.
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11th Apr 2020, 09:27 AM #20
What happened to sealer coat?
Clear is a finish coat
You can mix clear in the purple flake 5% should be enough to give greater depth. The still clear over the top.
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11th Apr 2020, 09:29 AM #21
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11th Apr 2020, 09:30 AM #22Golden Member
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Doing the primer sealer on all parts first. Then will lay down the white on everything other than the frame and forks. That will have them all done.
The forks and frame I have the option to lay the purple today too if I want, but the spec sheet says I have to clear or lay another coat of purple before clear.
As I will have the flake in the clear I’d rather not be mixing up clear twice so was thinking I would do the purple, flake (in clear) and clear in 1 go (when the flake shows up).
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11th Apr 2020, 09:33 AM #23
Why arent you ,mixing the flake in with purple & clear coat? Then do a purple 25% & 75% clear?
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11th Apr 2020, 09:34 AM #24Golden Member
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Painting metal flake
Because the metallic base coat is not 2k but the clear is. I also don’t have the flake here yet unfortunately, otherwise I’d be laying it all today ideally.
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11th Apr 2020, 09:44 AM #25
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11th Apr 2020, 09:50 AM #26Golden Member
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11th Apr 2020, 12:00 PM #27
A clear coat is required over any metallic automotive finish to protect it, are you saying the instructions say the clear must be applied within a certain period ?
Some of the painters I have been involved with will lay the color coat then let it dry, sometimes for days / weeks. The coat is then wet sanded to get a dead flat surface before the clear coat is applied.
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11th Apr 2020, 12:13 PM #28Golden Member
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Yep, that’s what the spec sheet says (bottom bit):
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11th Apr 2020, 02:08 PM #29Golden Member
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Painting metal flake
Ok that went well. I haven’t painted much other than a few kitchen doors but I’ve been watching non stop YouTube videos to get ready
Laid down my primer sealer, mist coat first, then once I’d finished the last piece it was pretty much time to go around again.
Second coat was a little heavier and then a third, mainly because I had enough paint in the gun still and didn’t want to pour it away.
I took the frame and forks out of the “booth” in preparation for painting the white.
What I learnt:
I’m pretty comfortable I got my gun setting right. Almost no fan and adjusted my pressure down by feel as I don’t have a pressure regulator on the gun. Went light on the paint flow and I think it worked out well, I got almost no overspray and managed to get 3 primer coats out of 225ml.
Also I don’t have anywhere near enough light. I meant to grab 2 lights at Bunnings this morning but annoyingly forgot! So for the white I decided to move each piece to the front of the booth each time as I could see what was going on.
The white paint was interesting. I used the same process of applying a light most coat first, then a heavier second and almost wet third. It worked really well on most parts and I got a nice gloss, but a couple of inclusions and one piece wasn’t quite as shiny as the others which I’m putting down to surface finish as it was stripped. I’m not worried as it’s the inside of the front sprocket.
I mixed way too much of the white too (150ml) and i ended up pouring a bit of that away too. I definitely only need about 100ml for the frame and forks max, maybe less.
Full dry time is 16 hours on the white stuff (PPG 625 Polythane) so I’ve left it hanging in the booth until it’s dry.
I’m planning on sanding and polishing these bits out of the white, do people think that would work?
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12th Apr 2020, 09:48 AM #30
Neevo do yourself a big favour and block the crank and fork thread areas asap. You'll end up with to much paint in the threads and have trouble putting it together, it will also damage the paint around when trying to thread it together. Berore doing anymore coats make sure threads are easy to put together, yes run the nuts into over the thread then push in paper or rag to protect during all other coats.
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