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Sanding color ?

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DDD
  • Member since
    March, 2019
Sanding color ?
Posted by DDD on Tuesday, May 21, 2019 9:13 PM

After laying down my final wet coat of Model Masters Acrylic gl blk. It seems that I was spraying paint with dirt in it.( any ideas why?) So now I need to color sand , do I sand it down and get crap out then spray another coat of paint? Do I need to go thru most of the grits 2000,2500, 3000 etc... Do I need to sand it down until it's all dull with no shinny spots? Need your process suggestions before I clear coat. Thanks

  • Member since
    December, 2003
  • From: Nova Scotia
Posted by Bainford on Wednesday, May 22, 2019 7:50 AM

I have no idea why the paint looks like it has dirt in it. Any photos?

If you are applying more paint, all you need to do is get the surface flat (that is, free of any sandy little bumps or orange peel, etc). Since you are going to apply more paint, you can get away with a fairly course grit sand paper. 1000 or 1500 will do. Do wet sanding, and preferably do block sanding where you can. I use an old vinyl drafting eraser as a sanding block and wrap the sand paper around it. This will allow you to flatten the bumps and irregularities in the paint without taking too much off, though be aware of panel edges. Also, when block sanding, pay attention to panel gaps at door and trunk lid shut lines. Paint will often 'stand up' at these edges and this is an opportunity to knock them down. If applying more paint, it is not necessary to sand the entire surface dull, only the bumps and irregularities that you want to get rid of.

If you have plenty of paint on the body and you plan to follow up with a clear coat, then I would colour sand (block sand, as above) to about 2000 grit, and again not necessary to make the entire body dull as long as you are happy there are no surface imperfections in those areas. Clean the body really well with mild soap and warm running water, blot excess off with a lint free cloth and let completely air dry. Apply clear.

Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away.
       - Antoine de Saint-Exepury

Trevor

DDD
  • Member since
    March, 2019
Posted by DDD on Wednesday, May 22, 2019 9:57 PM

 okay here is the trunk of my model. What did I do wrong?? Sprayed at 17 psi if I go any lower the it sputters and spits! Hopefully I inserted this pictur right, we'll see.

  • Member since
    December, 2003
  • From: Nova Scotia
Posted by Bainford on Thursday, May 23, 2019 8:09 AM

Unfortunately I can't see the photo. 17 psi should be plenty low pressure. I know that some guys regularly spray at pressures in the 15-18 psi range, but unless my paint is very thin those low pressures don't work for me. I usually spray in the 20-25 psi range, and up to 30 if needed.

What are you thinning your paint with? Are you thinning enough? Was the model washed, dried, and absolutely clean before you began painting? Is there water in your air supply? Just a few things to consider. Others may have better advice.

Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away.
       - Antoine de Saint-Exepury

Trevor

DDD
  • Member since
    March, 2019
Posted by DDD on Thursday, May 23, 2019 12:24 PM

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Okay I've been trying to insert pic so we'll see if this works

  • Member since
    December, 2003
  • From: Nova Scotia
Posted by Bainford on Friday, May 24, 2019 7:36 AM

I feel your pain. Posting photos on this site is excruciating. Hopefully someday the site will be dragged into the 21st century and allow onsite photo hosting. Until then you need an external hosting site such as imgur, flickr, etc (not an endorsement for either one). Open an account on a hosting site and upload your photos there. Once that is done, you need to copy the [IMG] code for the photo and paste it into your post on this site. Method for finding the [IMG] code seems to vary from site to site.

Some hosting sites are free and some have an annual fee. There is a practice forum at teh bottom of the main forum page where you can keep trying seemingly futile efforts to post a photo until you get it figured out. There is also a Community Assistance forum there with more tips on photo hosting & posting. It's such a pain that a fair number of forum members can't be bothered to post photos. It is the single biggest deterent to forum membership and use today. Good luck.

Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away.
       - Antoine de Saint-Exepury

Trevor

DDD
  • Member since
    March, 2019
Posted by DDD on Friday, May 24, 2019 9:54 AM

Okay, This is the 3rd pic I've tried to post! I even posted a test photo and it seems to be posted in the test section aleast when I log into SA I see the photo on my site? but it seems nobody else can see it. I used Imgur and copied the image to post on forums( I think it was called the bb code or the bbc code) and pasted it here in this box. So please let me know if it posted. and if it did what the heck did I do wrong on painting. Thanks

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