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Old 08-13-2016, 09:33 PM   #811
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Right now I've switched gears and I'm preping the exterior for real paint. The weather here should be good for another month.

The crappy temporary primer peels off the sheet metal I put up like a fruit roll up. I'm pretty excited to get this done. Lots of sanding and seam sealing. I'll probably tackle the prep and primer in 10 foot sections, then when the time comes to apply color, I'll want to scuff the primer and paint in one big, long go.

At least the original body on the bus will be easy. It'll be cool to have it be one color.
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Old 08-14-2016, 10:22 PM   #812
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First section with polyester primer. About 5 hours to clean, prep, strip failed paint from the sheet metal I added, and scuff everything else, and shoot primer.

So another week of work. I'm taking off next week to work on it, anyone want to lend a hand sanding? I'll turn it around so we can work in the shade.

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Old 08-14-2016, 11:11 PM   #813
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I would add that the coating I added didn't really "fail", its just not what I would trust long term. It did the job: protect vehicle long enough for us to have a better place to paint it right.

I remember two years ago (holy cow two years) I was dangling off a blackberry covered cliff on a ladder trying to get something onto the new metal. I also hung all the steel in torrential downpour weather. Hopefully I can get this thing wrapped up with a nice coat of real epoxy paint before fall starts. I don't want to have to worry about major paint work for at least 5 years...
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Old 08-17-2016, 12:28 PM   #814
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That's going to look real nice in one color! I can't wait to get to this step of my build. I have a lot to do before then though.

Did you use a direct to metal polyester primer or a good epoxy or etch primer before applying the poly primer?
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Old 08-17-2016, 12:36 PM   #815
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When you say "seam sealing" which seams and what did you use? Besides the windows we think we may have a couple seams leaking.
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Old 08-18-2016, 12:11 AM   #816
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Omni MP243 aka spray mud as the primer. Its specified as a DTM primer if its clean steel. A light sanding afterward yields a completely adequate subsurface for topcote. I thought I'd hate working with rivets and crappy surfaces that will never get fixed (usually I'm block sanding everything) but I have embraced the infinite imperfection that is a school bus body.

One bummer is being a polyester primer, I'm setting myself up for a week of pain while I go directly from priming to single stage epoxy topcote since its a bit porous and I don't want to risk absorption.

Upper half will be a vanilla whiteish color, rub rails black, skirt black. Maybe some sort of wanderlodgesque detail as well.

I'm seam sealing all the rails and panels and crud. I'll probably leave some gaps in the sealer on the bottom side of the rails to allow moisture to drain out still.

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Originally Posted by MuddaEarth View Post
That's going to look real nice in one color! I can't wait to get to this step of my build. I have a lot to do before then though.

Did you use a direct to metal polyester primer or a good epoxy or etch primer before applying the poly primer?
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Old 08-18-2016, 12:15 AM   #817
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I'm using upol tiger seal. Its easy to use, aggressive, easy to tool, and dries firm and flexible.
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Originally Posted by nevittja View Post
When you say "seam sealing" which seams and what did you use? Besides the windows we think we may have a couple seams leaking.
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Old 08-18-2016, 12:48 AM   #818
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Some more progress. The whole side is sanded, I covered with plastic to keep the moisture away until priming tomorrow.

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Old 08-30-2016, 01:23 AM   #819
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Bus paint

Well, this was a lot of work. Lots of pictures below.

Wire wheel strip all the failing paint from the new panels (didn't scuff them, cheap alklyd paint applied under humid damp conditions)


Then sand everything else, sand around all the rivets.
Scotch brite around the rivet dimples. Walnut blast remaining paint from rivet dimples.

There are several thousand rivet dimples.

Strip all the old seam sealer, fix rust starting on edges of some panels.

Remove weird tar crap killing adhesion to seam sealer at rear cap from underside of some of the roof panels on the rear (I reused those roof bits, bluebird applied it)

Scotch brite the panels, the rails, sills, edges, everything.

Fix some of the bent luggage bay doors properly, stripping off thick layers of bondo and hammer/dolly back to straight and true. (There's a relatively easy way to do this, ask and I will explain)

Wrestle with stupid broken rusted rear emergency hatch handle, drill it out, hammer it out, try not to break glass. (Didn't break it!)

Wax and grease remove all surfaces and spray polyester filling primer. On all 4 sides of the bus.

Seam seal all the joints and panels and rails with several tubes of pricey urethane sealer, let that dry for a few days.

Sand all the filler primer smooth (just 120 grit)

Mask everything, including roof and tires.

Wax and grease remove eveything, tack cloth all surfaces.

Spray two gallons of fleet urethane white. Watch a lot of it get absorbed into polyester (sort of expected that) and use the wrong gun and put too much on because you're tired and trying to beat the rain that's coming the next day and get a case of the runs. (Didn't really expect/want that)

Wait a day, shave all the runs off. Back bus under cover because its starting to rain.

Weather prediction gods smile. Take off next day from work my boss is rad and because fall is coming and I better get done or its all for naught when it rains.

Next day, I am gonna get this done in one day I say to myself. Buy more paint with kids and wife since I don't see them much lately. Sand, sand like I've never sanded before. 80 grit, make all those runs disappear, and the crappy wrong spray gun rushed paint.

Sand the whole bus! Scotch brite the whole bus! Tack cloth the whole thing!

Same day, lay two more gallons of the same fleet urethane. With the right gun this time, it goes on like butter on cut biscuits.

Find some spots that were light, touched those up. Argue with wife about paint pattern, she is right and I am just really feeling a little bit like falling over, I'm glad she's paying attention.

So that's where I'm at now. Pictures next post.
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Old 08-30-2016, 01:28 AM   #820
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Pictures.













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