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Originally Posted by 67velle
the talk in the trade is that the etch needs to have a undercoat before top coat .....this is for a barrier for the acid in the etch. my thoughts are that the etch never sleeps and what would you do if you lost adhesion later????how would you fix this..........I would put a undercoat over it ! as for the spray can etch I have used it for years with no problems  |
U-pol says that you spray their etching primer and then go straight to the raptor liner, with no mid coat. Here is the instructions for U-Pols etching primer, which is what I am spraying.
http://www.u-pol.com/countries/pl/do.../tds/acid8.pdf