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Old 10-19-2018, 08:58 AM   #41
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Well.... Lacking info to make an informed choice, I pulled the trigger on the SEM self etching.

It should be here Monday. Praying for good weather.

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Old 10-19-2018, 10:11 AM   #42
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Regarding "self etching" primers...


Check the label. Don't know about SEM but most call for applying a very light first coat and allowing a half hour or so of etching time before fully coating. A painter buddy here sez it makes a big difference in both bonding and rust prevention.
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Old 10-20-2018, 12:34 PM   #43
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Regarding "self etching" primers...


Check the label. Don't know about SEM but most call for applying a very light first coat and allowing a half hour or so of etching time before fully coating. A painter buddy here sez it makes a big difference in both bonding and rust prevention.
Thank you for the Tip!

You may have saved me from screwing it up.
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Old 10-20-2018, 07:43 PM   #44
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Ya...I get it. I am inclined to lay on as much as possible in one pass (runs included). So this was a good lesson for me too.
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Old 10-22-2018, 12:56 PM   #45
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Primer is "out for delivery", the sun is shining and the wind is still....

I went out to finish the last bit of prep before I shoot the primer on the bare metal and found the bus COVERED in aphids. I brushed them all off with a broom. Five minutes later and it was covered again.

I contacted the local Farmers Extension Agent and asked about them. Apparently conditions were ideal over the last couple days for them to hatch and they will be around until temps drop below freezing. Too cold to paint.

The options that I see are:

1- Go ahead and prime the metal to protect it over the Winter and accept that, in the Spring, I am going to have to sand all of their little corpses down and spray it again.

2- Leave the metal unprotected and hope for a weather window that will be warm enough to spray but cool enough to avoid the bugs. That would likely have me spraying primer in 40F-50F weather if I am lucky enough to get that. When we see milder temps in the Winter here it is usually damp/rainy.

3- Can't think of another option at the moment.... Suggestions?

I am leaning towards spraying & sanding later but I really have no idea how difficult that will be and if I would need to take it back down to bare metal .

If I have to sand it down to bare metal then I probably don't want to use the $100+ gallon of self etching primer that I bought. Better to find something cheap?

Any suggestions are appreciated as ..... This is really bugging me...
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Old 10-22-2018, 01:02 PM   #46
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In the two links that you posted, the first is for a gallon while the 2nd is only for a quart. The gallon is 98.86 while the quart is 37.20.
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Old 10-22-2018, 01:07 PM   #47
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I contacted the local Farmers Extension Agent and asked about them. Apparently conditions were ideal over the last couple days for them to hatch and they will be around until temps drop below freezing. Too cold to paint.
I'd get clarification on this. Do you just need an overnight frost to get rid of them or does it need to be below freezing for an extended period of time? I don't know bugs but I bet it's just a good frost you need. Might get warm weather after a snap.


Can you paint a section and cover it with plastic? Make stand-offs or something so the plastic doesn't stick. PITA no doubt but if it keeps the bugs off...

Paint on a windy(er) day? Not so windy that blows the primer away but windy enough the bugs are gone?
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Old 10-22-2018, 01:11 PM   #48
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Quote:
Originally Posted by Booyah45828 View Post
In the two links that you posted, the first is for a gallon while the 2nd is only for a quart. The gallon is 98.86 while the quart is 37.20.
Oops, thought I checked that. Maybe I was thinking it was 2 quarts to a gallon instead of 4.
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Old 10-22-2018, 01:28 PM   #49
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Thanks for the suggestions Bob.

The told me that a few days below freezing will kill the aphids off. If I wait for that I run a good chance of it being too cold or wet to paint.

We are having just enough wind from time to time to make keeping the plastic out of the paint challenging.

Any thoughts on going ahead with the spray and sanding them smooth later?

I did read a suggestion on another site that suggested spraying insect repellent on the vehicle..... I have to think that would be a bad idea.
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Old 10-22-2018, 01:58 PM   #50
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Additionally, I've had good results from painting in the cold. As long as humidity is low you can mix the paint with thinner to work in almost any temperature. Extra light coats, though. The paint runs real easy with the additional thinner and slower dry times.

The big problem I foresee is finding cool temperatures with low humidity in the pacific northwest. My past experiences are that the rain comes in strong and steady this time of year.
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Old 10-22-2018, 02:01 PM   #51
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Quote:
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We are having just enough wind from time to time to make keeping the plastic out of the paint challenging.
And that's not enough to keep them gone?

Quote:
Any thoughts on going ahead with the spray and sanding them smooth later?
A few bugs here and there, sand just those spots. Hundreds/thousands? Get something cheap and that is easy to remove? A latex or something you can peel off just for the winter.

Quote:
I did read a suggestion on another site that suggested spraying insect repellent on the vehicle..... I have to think that would be a bad idea.
Sounds terrible. Burning the bug candles would take a 100 candles. Only thing else I've got is a fan blowing directly on where you've painted. Not sure even a barrel fan would give you enough of an area to make it worth while.
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Old 10-22-2018, 02:30 PM   #52
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Additionally, I've had good results from painting in the cold. As long as humidity is low you can mix the paint with thinner to work in almost any temperature. Extra light coats, though. The paint runs real easy with the additional thinner and slower dry times.

The big problem I foresee is finding cool temperatures with low humidity in the pacific northwest. My past experiences are that the rain comes in strong and steady this time of year.
We do get some stretches of nice dry weather in the Winter. Unfortunately those days will be quite cold. We get less than 19" of rain annually.

Can you thin enough to spray, with good results, in near freezing cold?

Thanks.
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Old 10-22-2018, 02:40 PM   #53
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Sure can! Though conditions need to be just right and takes way longer to dry. Heck, I primed most of my bus with snow on the ground.

Around here the humidity is quite low in the dead of winter when the world is frozen. I've had the best success cold painting outdoors when the weather is well below freezing. If there's snow on the ground and the temperature peaks over the freezing point humidity will become a problem.

If you get desert dry conditions then I wouldn't fear much about painting at any time.

The best thing you can do is experiment with a piece of sheet metal leaning against a fence post or the like. Mix a small batch of thinned paint and tweak it until you can get a light finish with no runs.
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Old 10-22-2018, 02:48 PM   #54
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If you get desert dry conditions then I wouldn't fear much about painting at any time.
Sounds sketchy as hell to me but I'm east coast. It's never not humid.
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Old 10-22-2018, 03:04 PM   #55
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the RH is running in the low 40's today. Really a beautiful day except for the supplemental protein flying around.
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Old 10-22-2018, 03:09 PM   #56
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the RH is running in the low 40's today. Really a beautiful day except for the supplemental protein flying around.
Not bad for here but still kinda breezy.


3:47 PM Temp 54 F Dew Point 36 F Humidity 51 % Wind SSW Speed 13 mph Pressure 30.1 in Condition Mostly Cloudy
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Old 10-22-2018, 05:50 PM   #57
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Well, it is done. A gallon of SEM self etching primer applied with an HF HPLV gun.
Attached Thumbnails
Primer 001sm.jpg   Primer 002sm.jpg   Primer 003sm.jpg  
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Old 10-23-2018, 06:33 AM   #58
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Well, it is done. A gallon of SEM self etching primer applied with an HF HPLV gun.
AND?!!?

First and foremost, did you use the entire gallon? Was it enough/too much? I'll have a 2 foot band around the front and rear as well as 42" between rub rail and eyebrows to paint. Come to think of it, I'm putting it up unpainted. I can take the rub rails off once it's riveted in place but I'm not about to remove all the eyebrow rivets. Hmm, probably should have painted first.

Second, how were the bugs? Did they stay out of it?
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Old 10-23-2018, 07:00 PM   #59
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Results:

Three light coats on both sides used almost the entire gallon. I have a fairly nice uniform finish all around.

I wiped everything down with acetone right before I sprayed. I also wiped each panel as I went wit a dry clean cloth to knock any newcomers off before I sprayed.

I wound up with far fewer bugs in the primer than what I expected. Only a few hundred....

I did read on the SEM primer directions that I should not apply color directly to the self etching primer. Ok....

Now what kind of primer do I need to shoot on top of the SEM self etching primer before I shoot the Rustolium????
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Old 10-24-2018, 08:13 AM   #60
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I did read on the SEM primer directions that I should not apply color directly to the self etching primer. Ok....

Now what kind of primer do I need to shoot on top of the SEM self etching primer before I shoot the Rustolium????
Um, what? I'm paying $100 a gallon and I can't paint over it?!!? glad I haven't bought any yet.
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