Surface Engineering Forum

  • Alternative Forum Home PageSEF Portal
  • Old S E Message Board ArchivesOld Message Board Archives
  • Search
  • Member List
  • Calendar
  • Help

Current time: 04-26-2018, 08:45 AM Hello There, Guest! (Login — Register)


Surface Engineering Forum / Surface Engineering / Surface Engineering Threads v
« Previous 1 ... 19 20 21 22 23 ... 30 Next »
/ HELP spray over spray




Post Reply 
Threaded Mode | Linear Mode
HELP spray over spray
08-17-2009, 04:50 PM
Post: #1
jtwmc Offline
Newbie
*
Posts: 1
Joined: Aug 2009
Reputation: 0
HELP spray over spray
HELP !!
we have a roll 16" dia. 5' long
sprayed .100 to .150 total on dia.
with hard s.s.
customer said it is not enough
can you spray over it after it has been ground
with out taking it all off and starting over?
i was told and found out after coolant and oil is on it
it will seep out and new spray will not stick
what would be the best route
bake . sandblast . respray?
startover?
products?

THANKS
Send this user an email Find all posts by this user
Quote this message in a reply
08-17-2009, 08:38 PM
Post: #2
LEN WOOD Offline
BIGGER BETTER FASTER MORE!
******
Posts: 133
Joined: Mar 2008
Reputation: 9
RE: HELP spray over spray
Start Over and put it down to experience - you have to!
Visit this user's website Find all posts by this user
Quote this message in a reply
08-18-2009, 02:19 PM
Post: #3
Gordon Offline
Administrator
Posts: 1,786
Joined: Jun 2006
Reputation: 9
RE: HELP spray over spray
Hi jtwmc

Sign0016 to the Surface Engineering Forum.

Agree with GlenB, I would completely remove coating, re-prep surface and start again.

Some more discussion here re-applying-metco-308

Regards Gordon

www.gordonengland.co.uk
www.surfaceengineer.co.uk
Photography Obsession
Send this user an email Visit this user's website Find all posts by this user
Quote this message in a reply
08-21-2009, 12:04 PM
Post: #4
karunanidhi Offline
Active Member
****
Posts: 41
Joined: Sep 2006
Reputation: 2
RE: HELP spray over spray
Dear Gordon,

What do you think of blasting with SiC grit for the above case?
Send this user an email Find all posts by this user
Quote this message in a reply
08-21-2009, 04:09 PM
Post: #5
Gordon Offline
Administrator
Posts: 1,786
Joined: Jun 2006
Reputation: 9
RE: HELP spray over spray
Hi karunanidhi

Quote:What do you think of blasting with SiC grit for the above case?

Good blasting media, but I think it changes nothing said above. Coating on top of old coatings is a big risk at the best of times.

Regards Gordon

www.gordonengland.co.uk
www.surfaceengineer.co.uk
Photography Obsession
Send this user an email Visit this user's website Find all posts by this user
Quote this message in a reply
09-01-2009, 10:04 AM
Post: #6
k09 Offline
Senior Member
*****
Posts: 58
Joined: Aug 2009
Reputation: 0
RE: HELP spray over spray
Hi jtwmc,

I agree with gordon, spray over previous coating is never recommended. BUT...if the "circumstances" are such that you donot have enuf time and you have to return it urgently AND if you do think of spraying over the previous coating make sure you do the following things:

1) Clean the job thoroughly with solvent
2) Ensure that you have good surface roughness (atleast 6 Ra micron)
3) IMP* before you spray give atleast 4 to 6 passes of preheating at normal coating speed. this will ensure that "most" of the oil seeps out and vaporises.
4) then spray without over heating the job ( not more than 100DegC)

All the Best!! Big Grin

Regards

K09Mad0223
Send this user an email Find all posts by this user
Quote this message in a reply
« Next Oldest | Next Newest »
Post Reply 




Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  MO wire spray parameter for 3GF kim jong hun 1 121 04-13-2018
01:41 PM
Last Post: plasmajet1990
Question Winter spray problems Bacon 3 542 03-06-2018
07:44 PM
Last Post: ThePlummer54
  Info needed on Bond Strength for Thermal Spray powders hereticgame 1 491 10-10-2017
11:39 AM
Last Post: Vadim Verlotski
  601ns with uni spray gun sali 5 528 09-04-2017
05:55 AM
Last Post: loriolo
  Arc Spray and then Plasma spray? Is this common? cancun555 2 602 06-23-2017
07:11 AM
Last Post: loriolo
  Metco Super Spray Mask - alternative? Pete_F 3 906 04-12-2017
05:41 PM
Last Post: J!m
  Thermal Spray Tolerance Limit vancutan 1 913 12-17-2016
10:55 PM
Last Post: loriolo
  Propeller shaft repair by flame spray in the cones area Iwan Sedaryawan CA 1 780 12-09-2016
04:56 AM
Last Post: Stephen Booth
  Spray fused coating cracks Arturas 24 10,366 12-07-2016
02:57 PM
Last Post: abhay
  Flame spray guns 5P, 5PII, Type N Hector Monjardin 1 998 11-17-2016
10:35 PM
Last Post: mgbaca
  TAFA 9000 Arc Spray Globalteknik 0 750 11-13-2016
07:05 AM
Last Post: Globalteknik
  Cr2O3 chromium oxide spray problems by Plasma anne 9 3,079 08-01-2016
08:15 PM
Last Post: anne
  NiAl arc spray vs NiAl plasma CHI3 1 1,022 07-01-2016
05:11 PM
Last Post: Vadim Verlotski
  Plasma Spray 60% Alumina- 40% Titania Roughness Hector Monjardin 1 1,083 06-29-2016
10:42 PM
Last Post: Hector Monjardin
  Inert gas shrouded plasma spray MartyMc 1 1,293 06-23-2016
11:08 PM
Last Post: loriolo

  • View a Printable Version
  • Send this Thread to a Friend
  • Subscribe to this thread


User(s) browsing this thread: 1 Guest(s)





Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd

    Subscribe in a reader

    Contact Us | Thermal Spray Coatings | Return to Top | Return to Content | Lite (Archive) Mode | RSS Syndication

Powered By MyBB, © 2002-2018 MyBB Group.


© Copyright Gordon England