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Hi John. No offense intended so please don't take this wrong :), but I didn't ask about how to use primers or a lecture on the common mistakes a lot of people make when using primers (top of the list being using too thick a coating). I simply asked if anyone had used Orr-Lac zinc chromate and how it compares to Tempo and PTI for coverage. As a rule, I do not use any rattle can primer as a primer for anything I'm shooting with a color coat. The reason I asked the question is for some parts on a warbird restoration that were fairly heavily zinc chromate coated with no top/color coat. Tempo takes about four to five coats to reproduce the coverage. PTI only takes one to two coats but costs about 25% more. I was just wondering if anyone has used Orr-Lac and how it, at half the price of Tempo, compares. I requested a copy of the MSDS from the manufacturer of Orr-Lac (which they promptly sent) and judging from that, it looks like it should be pretty good spray can primer. Of course, anyone using zinc chromate and chromate products should be aware of the health hazards associated with them as well as how zinch chromate primer is designed to be used with a sealer/top coat for proper corrosion protection. (Even so, metal coated with only rattle can zinc chromate is still better than coated with nothing.) Tom > Tom, > > A primer is just that. You don't need full coverage and a totally > green part to make it work properly. The primer is to make your paint > stick to the metal or other paint when you're using dissimilar paints. > The faintest coat will suffice. As a matter of fact, MANY people use > WAY TO MUCH primer. If you spray it and the part has just a hint of > primer color, that's all you really need, more is a waste of product > and $$$ and usually adds drying time. Plus, primers are not hard; their > job is to help bond. If you put too much on, some primer will not > become part of the bonding process and leave you with a soft coat under > your hard coat. ALso, don't make your plane a green weenie and wait to > put the topcoat on. Sprayed primers have lives and looses it's > properties after a while, plus it scratches easily. When you see a > Boeing type plane being test flown in it's best greens, it is to > protect the metal underneath. That coat comes off and a fresh primer > coat put on before the topcoat. When painting over old paint, if you > can take the weight, sand it smooth, light primer that is designed for > your top coat, then your top coat. Follow the manufacturers > instructions, wear recommended protection. > > jsilberman > > > On Dec 25, 2006, at 7:15 AM, [EMAIL PROTECTED] wrote: > >> ----[Please read http://ercoupers.com/disclaimer.htm before following >> any advice in this forum.]---- >> >> >> Gang, >> >> Has anyone used the Orr-Lac zinc chromate spray can primer from >> www.skygeek.com? >> >> If so, how does it do with coverage - i.e. how many coats to cover - >> compared to Tempo (3 to 4 coats) and PTI ( 1 to 2 coats)? >> >> Thanks. >> >> Tom >> >> ======================================================================= >> ======= >> To leave this forum go to: http://ercoupers.com/lists.htm >> >> >> >> > > ============================================================================== To leave this forum go to: http://ercoupers.com/lists.htm
