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Sunday, April 08, 2012

City Bike Build, applying the primer.

Well since I'm working outdoors and the Montreal weather hasn't been the warmest lately, shooting paint has been put on hold until yesterday. I managed to lay the primer on between 2 gusts of wind and still got some over-spray in my glasses.

I found a place to hang the frame and as you can see from the images, it wasn't a pretty place! My number one concern was not to get any paint fly off on the finish of my car or the neighbor's house while still being able to have good access to the frame for the paint application.

Not a pretty paint booth but it works.

Since the surface to prime was already sanded and clean, see previous post, I was ready to shoot. The first thing you apply the paint to is underneath the frame and all those hard to get places. The top and sides always get ample coverage, it's always the bottom and those little nooks and crannies that get ignored in the process. So good coverage there when you start is a pretty good guaranty that you won't miss anything.

Start priming underneath and in those hard to reach places first.

Next you shoot the rest of the frame and make sure you have covered the entire frame. In this case it's pretty easy for me since I'm using a black Krylon Rust Tough primer on a red surface. Missed areas pop out pretty quick. Lay the paint in many thin coats, this will greatly reduce any drips. If you have drips that show up on your paint job, you're pretty much screwed at this point. Don't add more paint to the area, this will make it worst. Wait for the entire frame to dry, sand the spot in question and re-shoot the spot.

Frame fully covered in primer.

Talking about drying, you should wait at least 24 hours before shooting over with the finishing coats on the primer. Spray paint works this way, the color pigments are carried to the surface with thinners and you also have some propellant gases in the mixture to get all this stuff out of the can. It takes some time for all those chemicals to evaporate from the surface. Adding more to the mix by shooting another coat of paint over this doesn't help matters.

Direct sunlight will help the drying process and make any mistake pop out like Pee Wee Herman at a Board meeting!

One of the best ways to dry paint and stabilize this chemical cocktail is to expose your work in the Sun. I was lucky yesterday with bright sunshine and I was able to hang the frame in the sunlight for the afternoon. Despite this, I can still smell the evaporating thinners from the paint job this morning in my shop. I'll probaly wait another 24 hours to shoot the finish coat. Direct sunlight also has the advantage of making any spot you missed pop out instantly. It's nature's way of slapping you with a "You missed a spot".

Parts gathered so far.

I've started gathering some parts from my parts bin and other bikes that I have that are on ice for the time being. I hope to keep cost down by using what I have.

That's it for now.

Don't forget to check out the how-to articles. 

Until next time, ride safe and free.

Gerry :)

6 comments:

Anonymous said...

Looking better,almost done :)

The Disabled Cyclist

Gerry Lauzon said...

Almost being a big word here. :)

Keith said...

Hey Gerry,

I did two coats of primer and the 1st coat of paint this Easter weekend too! It was windy also here in Toronto which made it a pain to spray...alot of wasted paint blown away in the wind. Regardless it is looking pretty good so far!

I plan to do 3 coats of paint and then 2-3 coats of clear coat and then wait a full week for it to cure before I start putting the bike back together. Do you think that is enough for a durable paint job?

Gerry Lauzon said...

If you have the luxury of waiting a week for that paint to dry, please do. That should help greatly.

Gerry :)

Keith said...

Hey Gerry,

My restoration bike is done...check it out here:

http://myraleighbikerestoration.blogspot.ca/

Gerry Lauzon said...

Great job Keith. That Raleigh looks awesome!

Gerry :)