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teamgrumman(at)yahoo.com
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 Posted: Mon Jun 13, 2011 10:15 am Post subject: Jaguar Cowling questions Part 5 - painting |
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Boris,
The gray paint is a primer. Dave preps the inside of the tooling and then puts in 2 to 4 coats of primer. Brain fart right now, can't remember the name. That primer is to fill all of the pin holes that would be there if the glass were laid up without it. It's a good place to start.
Here are the steps I use. Of course, this is off the top of my head so I may miss something.
1) Locate any obvious imperfections. These will typically be in areas where two parts are joined.
a) Start with the deep or large areas. For deep or large areas, use any of the 3M body fillers (aircraft spruce) or even the new light weight bondo. They all work well.
Go to an automotive shop and talk to someone. If you have a favorite body shop, check there.
• Note: Deep areas: Deep is a relative term. We're talking 1/16 inch deep.
Large areas: Large is a relative term. We're talking anything you want to fill or shape.
After you've filled the large or deep areas, block sand with 80 or 120 grit sand paper. Once you get the imperfection filled, or surface blended, STOP.
• Note: Use quality sand paper from an auto body supply. This stuff is expensive. I buy rolls of 6 inch self adhesive disks, around $60 a roll. I buy 80, 120, 220, and 320 grit.
b) Now look over the cowling for small areas. Use Spot Putty (auto parts store) for any small imperfections.
Look over the whole cowling for every tiny pin hole or imperfection. This is the hard part. Mark them all with a pencil.
You may think you have all the holes; you'll know for sure when you paint your first coat of primer.
• Note: Small: Small areas such as scratches, pin holes, shallow dents, etc.
After you've filled the holes, let the cowling sit over night.
Get a sanding block(s) from the auto body supply. I have 6 inch, 12 inch and 18 inch blocks. Buy rolls of 3 inch self stick sand paper for the blocks. They are expensive too.
2) You've completed all of the initial sanding and prepping. Now, using the sanding blocks, block sand large areas to make sure they are flat.
The cowling is pretty straight so that should go quickly. You can buy sanding pads that bend around corners. They work well inside the exit ramps, inlets, etc.
Use 120 to blend everything. If you have a dual action sander, it makes this step go pretty quickly also.
3) When you are ready to prime, wash it with soap and water. Dry. Then, wipe down the cowling with DX 330. Tack off any dust with a tack rag.
Paint with 4 to 6 coats of K-36/K-201. Let dry over night.
4) Sand again with 120 grit. Block out the large flat areas with the largest flat block you can. Work your way to the smaller places.
Mark imperfections with a pencil. You can also buy a spray paint called Guide Coat. That helps a lot with larger areas.
5) Wash with soap and water. Dry. Wipe with SX 330.
6) Prime with 2 coats of K-36. Sand with 220 to get the big orange peel down. Then hand sand the whole thing with 320.
7) Wash with soap and water. Dry. Look for any imperfection you want fixed. Fill, sand, and repeat until you are tired of trying to make it perfect.
 Paint with any of the Poly-Urethane paints. I like Imron only because I've been painting with it for 30 years.
On the first 3 cowlings, I fitted, primed, sanded and painted the whole thing for $10,000. So, basically, for $3750, I invested about 60 hours per cowling, including paint.
From: "bvnj(at)yahoo.com" <bvnj(at)yahoo.com>
Sent: Sun, June 12, 2011 10:09:23 PM
Subject: Jaguar Cowling questions Part 5 - painting
Hi Gary,
I need a little help with painting. Unfortunately my only painting experience is the walls in my house.
What is the gray stuff on the outside surface of the cowls? A friend of mine saw it and said "gel coat". Is it a gel coat or is it 6 coats of k-36 urethane primer you mentioned earlier?
The instructions say "prime with two part epoxy primer". If there are 6 coats of primer already, do I still need to prime on top of it?
Should I use the same k-36 primer? If not, could you please recommend one? Do they sell it in the local auto paint store? If not, where can I buy it?
Normally I find things like that on the net but there is just too much info on painting. Gives me brain overload.
Thank you,
Boris.
On Jun 6, 2011, at 3:00 PM, Gary Vogt <teamgrumman(at)yahoo.com (teamgrumman(at)yahoo.com)> wrote:
| Quote: | ... I prime with 6 coats of K-36, thinned 20%. K-36 is a high build urethane primer. Block sand the first time with 120. Prime again with one or 2 coats as needed. Block sand with 320.
Gary
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teamgrumman(at)yahoo.com
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| Posted: Thu Jun 16, 2011 8:48 am Post subject: Jaguar Cowling questions Part 5 - painting |
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Boris,
My answer would be: probably.
For certain, 1 quart of paint is enough. Primer depends on how picky you are regarding the surface quality of the final product.
Imron is mixed 3:1. 3 parts paint, 1 part 192S. As far as I know, you can only buy the 192S in a quart. And that it's very expensive.
Gary
From: "bvnj(at)yahoo.com" <bvnj(at)yahoo.com>
Sent: Wed, June 15, 2011 2:49:15 PM
Subject: Re: Jaguar Cowling questions Part 5 - painting
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