Sanding grits..

angecarl

angecarl

Promoted Users
I know it's a broad question, but with my inexperience, I must ask. With my restoration, I used SPI epoxy and SPI 2k primer. After the 2k spray, I started sanding it with 180 dry then moved to 320 dry. Had to fix one spot with filler on lower quarter (primer was removed) I replaced and had a couple of small high spots that went to the metal. I just finished this weekend spraying another full coat of epoxy over entire car, because of repair & small shiners and also saving my pennies for Motobase and SPI clear. I can see but not feel sanding scratches in this coat of epoxy in a fair amount of places. I will likely spray another coat of 2k next weekend, but what would you use for sanding grits and wet or dry? Hoping this will be the last time before I'm ready to seal and paint. Can the car sit inside in 2k for a month till my purchase of base?

This brings me to another question about the previous 2k spray, I'm using 2.2tip on my FLG4 @24psi, I noticed I had alot of build up on my guns tip. What causes that? It sprayed on the car splotchy but after 15min or so it leveled out to a smooth finish.

Sorry for so many questions, but thanks AGAIN in advance.
Carl
 
I would probably spray 2 coats of 2K. I never spray one, it doesn't give you enough to sand. If you are pretty sure it's going to be the last round, start with 220 dry, guide coat, 320 dry, guide coat, then finish with either 400 or 600 wet depending if it is a solid or metallic. Which 2K are you using? That 2.2 is good for high build. It can be used for regular 2k, but I would probably turn the material knob in a little (1/2 to 1 turn in from full open). Clean the gun between coats to keep it spraying good. 2k will build up everywhere on and in the gun.
 
If I remember correctly, it has been advised here that you not leave a car in 2K for any length of time. After the 2K is sanded to perfection, I believe that you are supposed to spray a coat of epoxy to seal it for extended storage.
 
I have the same gun and use the same tip and haven't had an issue spraying 2K. Like texasking said, try turning in your fluid knob and see how that works. You can test spray on a piece of masking paper to make sure it's spraying okay before spraying your parts.

This is just my preference here, but I'm not comfortable starting with 180 and working my way up through the grits and going straight to sealer and base/clear because I always miss some scratches. So once I'm happy with the straightness of the panel and the filler/2K is all sanded with 180 or 220, I spray 2 coats of epoxy or 2K and then wetsand with 600 by hand and then spray sealer/base/clear.
 
texasking said:
2K are you using?
Click to expand...

I am spaying 2K regular build primer. I'm using the 2.2 tip because another member here said the same gun I'm using seemed to spray better with it. Most of my troubles is the big round thing in between my shoulders. My nerves kick in with spraying something new and having to adjust the gun for it, especially with the primer's pot life. I get anxious just thinking about that. However, gotten pretty good at laying the epoxy down, because I have done it multiple times and have a greater window to spray it in.

So, assuming after final 2k sanding, will it be best to spray unreduced epoxy for the car to sit a bit, then scuff for seal coat followed by base/clear application?

Thanks
 
I hear ya, I get nervous before spraying. You just have to relax and know that it will come out better if you can slow your heart rate and loosen up a little bit. With 2K, you just have to mix it really well, spray it, and clean the gun because it kicks fast. You can use epoxy too since it builds just the same, it just takes longer to dry. They're very different products - 2K dries really fast and sprays with a small pattern whereas epoxy dries slow and has a bigger pattern and will frogeye if you're not careful. If only there were a way to make a primer that has the quick drying properties of 2K with the adhesion and recoat window of epoxy...
 
texasking said:
then finish with either 400 or 600 wet depending if it is a solid or metallic.
Click to expand...

I have read over this post multiple times and didn't catch what you said in the above quote until now. So what I am being told 1966 Burgundy Mist is a metallic. What would you recommend I final wet sand with being it's metallic?
 
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