HELP spray over spray |
08-17-2009, 04:50 PM
Post: #1
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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 | |||
08-17-2009, 08:38 PM
Post: #2
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RE: HELP spray over spray
Start Over and put it down to experience - you have to!
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08-18-2009, 02:19 PM
Post: #3
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RE: HELP spray over spray
Hi jtwmc
![]() 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 | |||
08-21-2009, 12:04 PM
Post: #4
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RE: HELP spray over spray
Dear Gordon,
What do you think of blasting with SiC grit for the above case? | |||
08-21-2009, 04:09 PM
Post: #5
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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 | |||
09-01-2009, 10:04 AM
Post: #6
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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!! ![]() Regards K09 ![]() | |||
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