Wet sanding SS question

[Steverotonda]

I just sprayed 4 coats of black SS SPI. I ahead a ton of orange peel. Keep in mind I am a novice spraying outside in a make shift booth in Phoenix (113 degrees today). Not fun! It actually turned out nice though. I had to use 800 wet to get it almost flat. My question is, should I go 1200 followed by 2000 then buff or skip 1200 and go 2000 to 3000 then buff? I still have a few areas of peel that need to be addressed. Thanks everyone. I could not have done it without your advise.

 

[Steverotonda]

Pre-sand

 

[dhutton01]

Going to take some effort to remove 800 scratches. Use 1200 and maybe do one panel at a time to make sure your method is working. Be careful of your edges!

Don

 

[Steverotonda]

Yea, I burned through one spot on the entire car. Still debating how to deal with it.

 

[dhutton01]

You are looking at respraying the panel. If you had asked before you started I would have suggested starting with 1200. 800 is risky for a novice. I rarely go that aggressive.

Moving forward be very careful because you have less than four coats now…

Don

 

[dhutton01]

Also first grit should be dry so you can see when peel is gone….

Don

 

[Steverotonda]

Can I spot it in or use touch up brush then wet flat. I know it won’t be perfect. Consider my application situation.

 

[dhutton01]

Can I spot it in or use touch up brush then wet flat. I know it won’t be perfect. Consider my application situation.

You can but it will likely leave a visible edge. You could also read up on SPI blending solvent. Hopefully one of the pros will offer some guidance.

If it were me I would shoot a couple more coats.

Don

 

[shine]

you need to do 2 more nice flow coats. your way too thin to polish out .

 

[theastronaut]

800 is fine and works great to level texture but you have to be extra careful around edges and body lines, as you found out. I like to use a silver sharpie marker to highlight anywhere that is easy to sand through, it works like a guide coat so you can see when you've sanded just enough to get the texture out without going too far and burning through. After 800 switch to Mirka white dry guide coat, you can see the scratches coming out that way. Once you get up to around 2000 the guide coat doesn't really stick well enough to bother with, so sand all in once direction with 2000 then sand with 2500 in the other direction until all the 2000 scratches are gone.

 

[Lizer]

I wouldn't start less than 1000 grit, and 1200 preferably. As I learned from Shine (and this is what I do to this day), your grits should progress 1200, 1500, 2000, 2500, 3000 trizact, compound then polish.

 

[Steverotonda]

I hate to have to start over, and re-spray. If I did will the SS adhere to the 2000 sanded base?

I may see what happens when I polish first. If there is not another on...then I will scuff and re-shoot.

Thoughts???

 

[crashtech]

I tend to think you will have not only burn throughs but poor durability if you don't add more coats to that.

 

[Steverotonda]

Can I spray over 2000 grit sanded paint or scuff with a maroon scotch pad?

 

[Steverotonda]

2 or 3 more coats?

 

[crashtech]

3 at least. As far as painting over 2000, that's a good question. I actually haven't ever tried. I suppose if it was mine to do I would scrub every inch with a grey pad, a bit of Dawn dishsoap, and plenty of clean water. Techniques tend to vary, but I consider a red pad slightly too coarse for the purpose of topcoating like this.

 

[Chris_Hamilton]

Can I spray over 2000 grit sanded paint or scuff with a maroon scotch pad?

No, 2000 is too fine. You will have adhesion issues. The easiest way so that you don't have to do more sanding is to get some Presta Scuff Stuff and a grey scotchbrite pad and go over everything with that. Barring that 800 grit would be the finest grit that you safely shoot over.

 

[Steverotonda]

Thanks for the advise. I will gray scotch pad it, and hit it with 3 more coats.

 

[Chris_Hamilton]

Thanks for the advise. I will gray scotch pad it, and hit it with 3 more coats.

If you do it with a grey pad alone you will really have to work it and change pads several times. Using the scuff stuff you will get a much better scuffing. I would highly recommended it. Something like what you are doing you really need the extra insurance of a good scuff.

 

[crashtech]

Back in the dark ages we used Comet.