Coatings

[lkurek at smtpgate.anl.gov]

     If they are applied too thick, then yes...they run a good chance of 
     cracking and subsequently coming off. If the surface isn't properly 
     prepared (sandblast finish) and completely free of grease/wax/oil, 
     they coating WILL flake off. However, with all of the parts I have 
     coated...they seem to last pretty well if applied correctly.
     
     You don't want to dip the parts, even if you thin the coating...it 
     would still be WAY too thick. What I have found that works best is an 
     airbrush to apply the coating to a preheated part (150-175 degrees).
     
     TTYL!
     
     Larry


______________________________ Reply Separator _________________________________
Subject: Re: Coatings
Author:  <diy_efi at efi332.eng.ohio-state.edu> at internet
Date:    5/30/98 11:46 AM


I have heard that unless the coating is evenly applied (uniform thickness) 
it willcrack and flake off.  Does anyone  know if this is true?    This 
might sound off-the-wall, but for small parts, could they be dipped in a can 
of thinned coating solution?
     
^Bernie
     
     
>Robert Humphris wrote:
>>
>> >The parts ARE fully coated, but they are definitely not EVENLY coated. 
The
>> >ID of the colectorhas runs and bloches in the greenish grey coating, but 
the
>> >outside black coating is smooth and even.    Will it last? I have them 
>> >installed, and it's easy for me to disassemble the collector to inspect, 
so
>>       I'll know in a couple of months. 
>>
>> I hope that smoothnes and even coating isn't a problem, as I have lots 
>> of little runs, blotches etc in the stuff that I did.. I cleaned up the 
>> pistons as best as I could and it all seems to be okay for fit etc..
>> Unfortunately I have run out of money and will not be getting my coated 
>> engine running for the forseeable future...
>>
>> Rob
>
>I had some problems applying CBC to my pistons.  Seems the 
>air pressure wasn't high enough in the airbrush and the 
>coating ended up too thick.  It bubbled and looked cracked, 
>so I'm going to sandblast it back off and try again.  DFL on 
>the sides looks great, though.
>
>What coating(s) did you use and how are you applying it 
>(them)?
>Shannen
>