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Post by emd16645 on May 19, 2014 3:51:37 GMT -5
I am currently working on a side project that I am going to have to paint some Delrin pieces. I'm well aware of the difficulty of adhering paint to Delrin, but I'm not sure of the best means to get good adhesion. I've read that grit blasting the parts helps, but I don't have access to that equipment, so it isn't an option. I've also read about using a spray-on compound that helps with paint adhesion. Could someone clarify what product I should be looking for and the best method of using it? I am also open to other suggestions. Thanks in advance.
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Post by santafemikie on May 19, 2014 10:20:18 GMT -5
I have used the Microscale Micro Prep MI-11 with very good results. It comes in a 1.5 oz. bottle. Just follow the directions... It works for bonding CA also.
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Post by Mark R. on May 19, 2014 11:46:04 GMT -5
I always give delrin parts a wash in laquer thinner to make sure any mold release is removed. I then spray them with adhesion promoter followed by either the color coat or primer depending on the color of the part and what color I'm painting it.
Adhesion promoter comes in a spray can and can be found at any well stocked automotive paint supplier. It's what they use on rubber bumpers and the like to help paint adhere / flex. I've also heard you can add some adhesion promoter directly to the paint for a one shot deal, but I've never tried it that way, so can't say if or how well it works.
Be sure to follow the directions on the can exactly - you have a very small window between spraying on the adhesion promoter and your color coat. It has to be between wet and tacky to work the best.
Mark.
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Post by hotshot3305 on May 19, 2014 17:19:48 GMT -5
Chris, go to your local NAPA dealer and ask for a 15 oz. can of NAPA 7223 Polypropylene Clear Primer. This primer will give excellent results right out of the can.
I suggest that you spray this primer in a small jar and then pour it into your airbrush for best results. I use it in my Paasche airbrush with a #5 tip and it requires no thinner. The primer will dry completely in a matter of minutes, but I always try to give it 24 hrs before spraying the final color.
Bob
Bob's Custom Models
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Post by m a y o r 79 on May 20, 2014 5:20:01 GMT -5
Thats a great tip Bob, ill have to give that a try.
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Post by diesel on May 20, 2014 22:43:17 GMT -5
Thanks to all in this thread again from me too! This is one I've also dealt with
and with less than expected results. I tried the car bumper primer, but I didn't
wash the parts in laquer thinner. -that's gotta be a quick rinse right? So I will
try that as I still have that can of primer. I will also try the NAPA 7223 primer
as I am having a hard time finding Smokey Valley stanchions and could
find myself using delron handrails.
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Post by Mark R. on May 20, 2014 23:05:38 GMT -5
Delrin is impervious to laquer thinners, you don't have to worry about it doing anything to them. I use laquer thinners to clean side frames as well before painting - but test on the back first, not all side frames are delrin ! Just pat a bit of thinners on the back with your finger - if it gets tacky, it's not delrin and will damage them.
Mark.
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Post by emd16645 on May 21, 2014 13:12:51 GMT -5
Thanks to everyone for the replies. I will be stopping by NAPA on the way home from work, and will give the primer a try. Weather is looking bad for painting over ther next several days, but when I get a chance to get it done, I'll pass on the results!
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mkl194
Trainmaster
accelerating rust on purpose
Posts: 131 
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Post by mkl194 on Jun 25, 2014 11:23:50 GMT -5
I've had tremendous success following this procedure:
1. soak the pieces in baking soda and hydrogen peroxide - I don't have an actual time on this, sometimes I've waited 10 mins other times it's been days and I can't tell the difference.
2. use a toothbrush and water, but don't use soap {if you must then soak with denatured alcohol for a few minutes to get rid of the detergent}
3. check someplace like walmart that sells camouflage spray paint, if you find the color that is close to the color you want it will stick and with it's super flat finish it will act as a primer for subsequent paint such as weathering.
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fr8kar
Chairman
Little man raise the cotton, beer joints get the money
Posts: 309
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Post by fr8kar on Jun 25, 2014 11:47:11 GMT -5
Delrin is impervious to laquer thinners, you don't have to worry about it doing anything to them. I use laquer thinners to clean side frames as well before painting - but test on the back first, not all side frames are delrin ! Just pat a bit of thinners on the back with your finger - if it gets tacky, it's not delrin and will damage them. Mark. Great tip, Mark! |
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