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Gregg
Posted: Tuesday, May 17, 2022 1:55:36 AM
Rank: Advanced Member
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Joined: 8/12/2002
Posts: 851
Location: New York
I know this has been answered in the past but I can't find the past answer. I am painting some brass pieces that I soldered. After, I washed off all the flux, dried the part and applied rust oleum primer from a spray can. When that was dry I used a rust oleum CAT yellow paint. Most all the various areas took the paint wonderfully except one 4 inch long piece. This part has all this crazing on the front of the part but NO crazing on the back part?? So I wait 4 days, crazing never went away. I strip the entire part that I made, down to bare metal, brass, and start all over. Same exact problem occurs on the same part of the one brass area. Yet, all the rest of the brass that is a part of this modification has taken the paint very well. Any ideas ?
Thanks.
kcmtoys
Posted: Tuesday, May 17, 2022 11:30:16 AM

Rank: Advanced Member
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Joined: 4/3/2003
Posts: 2,070
Location: Rockford,IL.
Could be a number of issues. Sand the area, clean the area with Acetone or Alcohol (not booze, HaHa). Humidity and moisture greatly affect spray paint cracking. Paint thickness along with product compatibility can cause the problem also. I let the primer (Rustoleum) completely dry overnight before I apply the top coat. Good luck, hope this helps. Teeth
Gregg
Posted: Tuesday, May 17, 2022 11:33:31 AM
Rank: Advanced Member
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Joined: 8/12/2002
Posts: 851
Location: New York
kcmtoys wrote:
Could be a number of issues. Sand the area, clean the area with Acetone or Alcohol (not booze, HaHa). Humidity and moisture greatly affect spray paint cracking. Paint thickness along with product compatibility can cause the problem also. I let the primer (Rustoleum) completely dry overnight before I apply the to coat. Good luck, hope this helps. Teeth
Thanks very much for the reply and ideas!
RMS Models
Posted: Wednesday, May 18, 2022 4:59:49 PM

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Joined: 8/27/2002
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Location: New Jersey
Clean with Acetone or Alcohol BEFORE you sand !!! Sanding will drive the contamination further into the substrate.
Talyan55
Posted: Wednesday, May 18, 2022 11:57:39 PM
Rank: Advanced Member
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Joined: 12/2/2013
Posts: 72
Location: California
These are the steps i would take:

1: Sand down the parts in all the ares.
2: Wash the parts with soap and rinse in hot water
3: Wipe the parts with alcohol
4: Warm up the parts with the heat gun or a hair dryer
5: spray very lite coat and walk away for 10-20 minutes
6: Apply another very lite coat and walk away for 10-20 minutes
7: Apply final coating

Hope this helps
Gregg
Posted: Monday, May 23, 2022 1:51:20 AM
Rank: Advanced Member
Groups: Member

Joined: 8/12/2002
Posts: 851
Location: New York
Thanks everyone for your advice.
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