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Author Topic: NAPA DC-540 PRIMER  (Read 954 times)
Frank Imbriaco
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« on: April 15, 2017, 05:45:17 PM »

Thinking about saving some dough and possibly weight by no longer using a 2K urethane primer and instead trying the NAPA DC-540 .
Couple of questions :
1) Any issues with it over  Randolph low-taut nitrate dope ?
2) Likely will apply white  Dupont  Chromaseal   over it .  I've used this stuff before, but only over 2K urethane primer. Any issues with it over NAPA DC-540 ?
3) Colors will be Dupont Basecoat followed by Dupont 2K  Chroma Clear .

Thanks
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Walter Hicks
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« Reply #1 on: April 15, 2017, 06:07:44 PM »

I had some bubbling issues but not sure it is directly related to the primer. I now use 2 part auto primer. I use base coat clear coat auto paint.
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john e. holliday
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« Reply #2 on: April 15, 2017, 09:12:31 PM »

I used it over base coats of butyrate dope that had set for several weeks.   Then the automotive color was applied after sanding with 300 grit paper.  Final coat was 2 part automotive clear.  I am not a finisher so there are some rough spots to the feel.


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John E. "DOC" Holliday
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Tom Luciano
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« Reply #3 on: April 16, 2017, 06:08:21 AM »

I had no issue using over non taut nitrate.
Tom
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Fredvon4
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« Reply #4 on: April 16, 2017, 07:46:39 AM »

I did one plane a year back with Nitrate initial then DC540 I think too soon... 2nd day and in a hurry first coat of the primer immediately crinkled up in several small spots....grrr  on the remainder of the fuse I backed off  a few inches and sprayed very lite coat, then a few minuets later a good wet coat..... and no problems

good news is, once DC 540 was good n dry the crinkly areas sanded down just fine

I am sure I put the DC540 on too wet over not well gassed off Dope
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Fred von Gortler
Frank Imbriaco
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« Reply #5 on: April 17, 2017, 10:08:15 AM »

Ok. Thanks to all. Still need to know how it reacts with  Dupont 2k sealer  followed by Dupont  base coat colors / 2k clear coat .
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john e. holliday
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« Reply #6 on: April 17, 2017, 10:35:38 AM »

If in doubt try it on sample piece of work.  I usually wait a couple of day for base coat of what ever to cure/dry/air out.   Before putting color on I usually put a seal coat of clear.  I was told one time not to put on heavy coats,  go lightly with the paint until you get the layer you want to work.
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Matt Colan
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Matthew Colan mcolan94 flycl756355
« Reply #7 on: April 17, 2017, 03:29:05 PM »

Ok. Thanks to all. Still need to know how it reacts with  Dupont 2k sealer  followed by Dupont  base coat colors / 2k clear coat .

I used it on my last plane without any issues using the 2K sealer or any of the other chromabase colors/paints. 
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Matt Colan
Walter Hicks
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« Reply #8 on: April 17, 2017, 09:10:21 PM »

Matt did  you use basecoat auto paint for the color?
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Matt Colan
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Matthew Colan mcolan94 flycl756355
« Reply #9 on: April 18, 2017, 03:13:44 PM »

Matt did  you use basecoat auto paint for the color?

I used the 2K sealer that Frank was asking about on my last plane.  It's an automotive sealcoat that I used as my basecoat on the last two airplanes.  the Dupont Chromabase went over the sealer without issue
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Matt Colan
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« Reply #10 on: April 19, 2017, 07:46:49 PM »

Has anyone used DC-540 as a filler/primer for a dope finish? I am using it for the first time and so far have been impressed. Not to the final color/clear stage of the finish yet though. Cool
« Last Edit: April 20, 2017, 08:38:35 AM by Balsa Butcher » Logged

Pete Cunha
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Tom Luciano
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« Reply #11 on: April 20, 2017, 03:39:10 PM »

Yes, quite a few of us have used it  with dope with good results.

Tom
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« Reply #12 on: April 20, 2017, 06:40:32 PM »

Great! and thanks. That is the answer I was hoping for.  Cool
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Pete Cunha
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