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Vht231d minimum spraying temperature to cure
Martin6:
Four months ago I took the engine back to bare metal. I painted my cases with a light coat of etch primer, then 2 light coats of Simoniz VHT silver and then 2 light coats of clear engine lacquer. I was concerned about cooling, so I only applied 2 light coats of the Simoniz VHT silver to the cylinder barrel fins, no primer orr lacquer. I didn't oven bake any of it.
On the first wash, after a couple of rides, I noticed some paint coming off the cylinder barrel, but not the cases, when I towel dried it. So I've been blow drying ever since.
This week, having had about 20 heat cycles through the motor, I tested the fins and they now seem fine, no paint transfer. I expect, without the oven treatment, it needed a few heat cycles and some time to fully cure. I'm hopeful it'll be robust now.
Honda enthusiast:
--- Quote from: Martin6 on April 13, 2024, 11:00:21 PM ---Four months ago I took the engine back to bare metal. I painted my cases with a light coat of etch primer, then 2 light coats of Simoniz VHT silver and then 2 light coats of clear engine lacquer. I was concerned about cooling, so I only applied 2 light coats of the Simoniz VHT silver to the cylinder barrel fins, no primer orr lacquer. I didn't oven bake any of it.
On the first wash, after a couple of rides, I noticed some paint coming off the cylinder barrel, but not the cases, when I towel dried it. So I've been blow drying ever since.
This week, having had about 20 heat cycles through the motor, I tested the fins and they now seem fine, no paint transfer. I expect, without the oven treatment, it needed a few heat cycles and some time to fully cure. I'm hopeful it'll be robust now.
--- End quote ---
Yes, that's how I'm going with mine, from past experience it's the front of the engine which is exposed to water spray and road dirt so I'll try and harden that up with the heat lamp....no rush, I'll get there and like you say the heat cycles will do the rest. I'm still considering doing the outside breeze block oven method by Ashmoto.
As a matter of interest do you have a Moto Martin 6?
Martin6:
No, my name's Martin and I have a K6 CB750! :)
Mike_Berkshire:
--- Quote from: Martin6 on March 23, 2024, 05:16:51 AM ---I only had the head and cylinder block off, so I couldn't put it in an oven!
I took it back to bare metal with brass brushes in a Dremel.
--- End quote ---
Thanks for posting this. I am thinking of doing something similar with my 550 rebuild. I plan to rebuild the top end but not the bottom end which seems fairly sound apart from the paint. Do you have any tips for removing the old paint other than using a dremel & brass brushes? I was thinking of using a Scotchbrite pad or wheel to prep the surface before etch primer.
Martin6:
I don't think a scotchbrite pad will be aggressive enough. May be wrong, but I would expect that to be a long job and lots of pads. 240 grit wet and dry, used dry, might be better, but the creases and corners will be tricky, if you try to get all the paint off. I found the dremel, used with the flexible extension head and a range of brass brushes, worked quickly, got into nooks and crannies and didn't damage the alloy. I then went over once with some wet and dry to key it. Took me 2 to 3 hours to do and another hour to brush clear all the little brass tines off the floor. You do go through the brass brushes in that job.
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