Minor Rust Repair - Part 4 Priming
Posted by Jay Schneider. Filed under Automotive.
August 2, 2010
PRIMING FOR SUCCESS
Priming a metal surface certainly isn’t rocket science; however certain fundamentals must be understood in order to succeed. Cleanliness – once the finish has been converted using Chromic Acid – do not touch the finish with bare hands! Doing so may sacrifice paint adhesion maximization. Proper mixing ratios of the material. Proper amount of material applied to the surface. Proper flash times between coats of paint. All of these parameters must be adhered to as specified in their corresponding manufacturers technical data sheets.
The first primer applied is called a “self etching” primer – the reason for this? This primer bites into the finish as well as prepares a surface to which the next primer, a 2K urethane High Build primer, has something to bond to. This “High Build” primer is used to fill in small defects enough in order to sand them down rendering them unnoticeable – a lot like a body filler would. For optimum results, follow the primer manufactures recommended procedures. The primers may be applied in one session however there are flash and cure times between coats. Allow roughly 4 hours for these operations to be accomplished together. Should you feel confident that no defects are evident, a top coat and clear coat may be applied in succession to finish the repair. It is of my opinion, to not hurry the process along, allow the primers to cure over night and down the high build primer to make certain no other repairs are needed, and then prepare the surface for the top and clear coats. As will be our next topic…
Scott S. Mc Lain
Lake Country Mfg.