epoxy questions

It depends on the bumper material. Any primer will stick to urethane, but no primer will stick to TPO or polypropylene without adpro.
 
so i need to find out whatg my bumper is made of? or use an adpro just to be safe?
 
Carve off a sliver of your bumper from the back and try to make it sink in a cup of water. If it's a floater, it needs promoter.

Don't use adhesion promoter unless you have to.
 
crashtech;9781 said:
Carve off a sliver of your bumper from the back and try to make it sink in a cup of water. If it's a floater, it needs promoter.

Don't use adhesion promoter unless you have to.
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Yes sir, that one goes into my "What every painter needs to know." collection.
 
Technically, there are some varieties of TPO with a density greater than water, but I have not ever seen these in automotive applications. Someone with more knowledge than me would have to chime in about high density TPO and where it might be found.
 
ok, i'm going to order more epoxy, but this time to paint the headlight buckets of my car black. I was going to use a SS black after I clear, but I think this was will be better.. plus it gives me more epoxy on hand.

I don't need anywhere close to a quart of black epoxy for the buckets and other small parts, I probably need a few ounces. I'd like to put aside half the can for the buckets, louvers, and maybe some hood stripes if my vinyl stripe it doesn't work.

with the other half of the can, I was thinking of mixing it with whatever I have left over from my quart of grey, and mixing a sealer color very close to my charcoal grey base coat I'm going to put on over the top of it

first of all, I want to be sure there's not a problem mixing the two epoxies

second, is it a bad idea to make my sealer exactly the same color as my base coat? I can see some big advantages, but if it's real close I may accidently not spray something, and not realize it until I'm past that spot
 
All colors of SPI epoxy are compatible with each other, as a matter of fact I keep only black and white gallons of epoxy on my bench, typically making a 50/50 blend for normal priming operations. Having a full range of grey shades available gives a lot of flexibility for sealers and such.

I think it's a fantastic idea to make your sealer the same shade as your base. Having contrast to aid the painting process is highly overrated, I mean, what do you do on your second and third coats, when the contrast is no longer available? You just have to learn how to watch what you are doing, depending on the way the gun is moving, gloss, and texture to tell you when you have coverage.
 
thanks! it's a good thing I'm painting charcoal grey... not too many colors you can do this with and go for a perfect match

I'm excited about the epoxy!
 
crashtech;9781 said:
Carve off a sliver of your bumper from the back and try to make it sink in a cup of water. If it's a floater, it needs promoter.

Don't use adhesion promoter unless you have to.
Click to expand...

I played "will it float?" today, and put a small chunk of my camaro bumper in a glass and it sank like a rock. I guess epoxy is all it needs!

thanks again
 
jcclark;9971 said:
Why not? Is there a down side????
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I have always been told that it doesn't hurt to use it, even when not needed, other than cost. I am waiting for a more knowledgeable reason not to.

Aaron
 
Use of adpro on surfaces that do not require it can reduce adhesion, and in the best case will not improve adhesion at all. But feel free to use adpro on everything, especially if it is SPI. I would not want to be responsible for a reduction in sales.
 
I liked the idea of matching my basecoat charcoal grey to the grey of the epoxy so much that I went ahead and ordered a quart of black today. That will be nice to have.

if somebody could give me a rough guess about how much epoxy I should save for a sealer coat, I would appreciate it. I'm painting a 89 camaro, and I plan on mixing it 1:1:1
 
you'll do it with 1.75 quarts sprayable I bet-if you're doing only the exterior
 
So I need to make sure I have a little over a pint of primer left for the sealer. I should be able to do that, thanks
 
I started spraying today! I puller about 14 Oz out of the quart, and used it to put a coat over some bare metal parts I've been working on. The rest of the grey I mixed with half of the black quart to create a shade of grey that matches what my base coat will be. I'll spray a little of that, but I'm trying to save most of that supply to use as sealer. I still have some parts I'm going to spray black epoxy with the rest of the black quart

thanks so much for your patience with all my questions. This is the first time I've ever used epoxy at all, so its uses and abilities are still new to me


I really like my LVLP gun! hardly any overspray and it has a great fan. It's amazing for a $50 gun



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yes! I love getting to the stage that I'm putting something ON the car instead of taking it off.

today for the first time I actually wrote out all the things I need to do to finish the project, in order. until now the list has been too long to even bother thinking about

1. prime the entire car with high build primer. sit it out in the sun for a couple of days to cure and shrink

2. paint the hood hardware and grill with black epoxy

3. Block the whole car down until totally smooth (with a guide coat)

4. paint the underside of the hood, tops of fenders, door jams, and the gully around the hatch

5. install the new front clip

6. base and clear the whole car

7. Install keyless entry system while I put the doors back together

8. block the clear down smooth, then buff

9. Paint headlight buckets

10. Install stripes
 
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