epoxy questions

5

58mark

i've got a few spots on my car that I've sanded downto bare metal. 99% of the car is either factory finish or factory primer.

Can I put epoxy over everything? or is epoxy just for use on bare metal?

second question. if I do spray 3 coats of epoxy and block it down, can I put base coat on top of that? I seem to see most putting regular 2K over epoxy.

if we're just talking about a few bare metal spots, should I forget about epoxy and use something else, like go right to 2K, use spot in something else before the 2K?

thanks... I am a little confused about when and how to use the different types of primer
 
Epoxy is a must over bare metal, then from there it is your choice.

I no bodywork you could spray the epoxy and sand smooth and paint, or spray with 2K primer and block and paint.

Epoxy will go over anything.
 
Thanks barry.

So.....if epoxy will go over anything, and you can put base coat right on top of it, then what is the purpose of 2k? Extra filling for body work? Could I just use more epoxy?

Sorry if these are stupid questions, but the closer I get to making a purchase, I just want to make sure i'm educated
 
Not as easy and if there is bodywork, blocking epoxy should be left for the very expierenced, 2K is much more forgiving.

If just bare metal, skip the 2k.
 
Thanks for clearing that up. Looks like i'll be buying both. Is there a tech sheet available for the epoxy? The link on your website doesn't bring one up
 
another epoxy question...

how much reducer if i'm using it as a sealer over the top of 2K high build? the tech sheet says 10 to 50%... that's a pretty wide range. what do most people use?
 
wow! that's really reduced...

what's interesting is the tech sheet for epoxy doesn't agree with the SPI perfect paint job writeup at all...

tech sheet

To use the epoxy as paint sealer, reduce 10-50% with the proper temperature range
urethane reducer (this is very important). Spray one wet coat ONLY, let it set 60 minutes
and apply paint. For sealing of a potential problem paint job apply two coats of epoxy
with proper flash times between coats and let it set over night before painting.
Click to expand...


perfect paint
http://www.southernpolyurethanes.com/perfect paint.htm

When all of the primer blocking and any necessary primer repairs are finished it’s always best to use the epoxy as a sealer. Mix up enough epoxy to go around the car with one wet coat and adding a double shot glass of SPI #885 Urethane Reducer per quart. Let the epoxy set for 30 minutes. Stir one more time and strain. Spray one full wet coat of epoxy over the entire car. The epoxy should set for 2 hours before spraying basecoat or the next option is let it set over night and wet sand the epoxy with 400-800 then spray the base.
Click to expand...
 
treat mixed epoxy just like base. reduce it to suit your needs. i do a 1:1:1 so it will lay smooth with no need to sand.
 
58mark;9230 said:
wow! that's really reduced...

what's interesting is the tech sheet for epoxy doesn't agree with the SPI perfect paint job writeup at all...

tech sheet





perfect paint
http://www.southernpolyurethanes.com/perfect paint.htm
Click to expand...

They don't really contradict each other, don't think of the Guide for the Perfect Paint job as being the same for normal everyday use of all the products. Anytime two coats of epoxy is applied it needs more time before paint is applied. Mix ratios for epoxy as a sealer is dependant on spray equipment, skill level, and build requirments if sanding is planned.
 
I just did this exact thing last night. Not saying I'm right, but I just mixed a spash of reducer (probably less than 10%) and sprayed w/ a 1.4 tip in my gun. I layed on 2 wet coats with plenty of flash time. Now the surface is pretty smooth but has some imperfections. I knew it would be a few days till I was ready to lay base coat so it's ok that I didn't go heavy on the reducer, plus I wanted good coverage as there are some sand thoughs here and there and they can bleed though a thin wet coat. I have to clean the garage, put up plastic, etc. to make a more dust free environment to spray base and clear in so the epoxy will be in good shape by the time I'm ready. I'm doing a metallic base so I will wetsand w/ 600 to get any trash and bugs out (never have bugs in the winter when I usually spray) and I'll have a nice smooth surface for the metallic.
 
Epoxy reduced 1:1:1 covers better than I would have guessed. When I use it as guidecoat, it takes quite a few sanding strokes to break through.
 
another epoxy question.


For bumpers, do I have to use adhesion promoter if I'm putting the epoxy on, or will epoxy stick to a raw bumper just fine?

the entire bumper isn't bare by the way, but it does have some bare spots on it
 
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