Posted: Sat Jul 15, 2006 8:03 am Post subject: Primers etc
I am restoring an Austin 101 wich I intend to have professionaly painted at some future point. The problem is I have received conflicting advice on how I protect the repair areas. Apparently if I prime the repar areas now but do not apply the finish coat for some considerable time (as will be the case) there is a possibilty that the primer will absorb moisture which can adversely effect the application of the finish coats. My question is, is this correct and if so what can I use to protect the metal now that will not cause the painter major problems when the time comes?
Posted: Sat Jul 15, 2006 1:05 pm Post subject: primers
Glad you joined in. You know me as Austin_101 on the welders forum.
I can't answer your question; it is a minefield, isn't it! I have read quite a lot about POR-15, especially in the Frost catalogue www.frost.co.uk which claims to actually dry harder in humid conditions!
The information about primer is correct. All primers that I have encountered over many years of restoring are porous, and therefore will allow the passage of water, and allow rust to form underneath. However...
What I started doing a few years ago is the following. All these are American products simply because they are the ones that I can get hold of easily. When the surface is absolutely free from rust, I spray it with a self-etching primer, usually PPG DP40. Then I apply a skim coat of a waterproof filler, such as Duraglass. I can then leave the surface as long as I want, and it never seems to rust. When I am ready to paint, I then flat the skin coat, but leave it whole. Then I cover with a urethane primer, either PPG K200 or K36, which I flat and topcoat.
Sometime in the future, I am thinking about trying to use POR15, but I am very unsure about it. I do know that even if their Tie Coat primer is used, certain paints react with it. And yes, it does dry better in humid conditions. In fact, it MUST have humid conditions to dry, but so do other paints of this type, such as Miracle Paint, manufactured by Bill Hirsch.
As far as coachpainting (handpainting) goes, sorry Rivet101, but you can forget it. That was done by REAL craftsmen, and not by people who THINK they can just because they can get hold of Tekaloid!
Rivet, if I could get hold of the materials I needed, I would coachpaint your cab with pleasure! Trouble is, some of them were banned long ago...
When its ready, spray your project. Iīm going to give you a reason for doing it that way, even if it alienates other members. Every amateur that Iīve ever met has "coachpainted" their project for one reason, and one reason alone, even if they state otherwise. To save money!
I dont know about starting a painting thread, after looking at the welding forum, we should start a welding thread!
You didn't like the welding forum then? I thought it seemed rather good, though I haven't looked back at it for a while; been too busy at school...but now it is school holiday time....the summer is a long period of intense activity.
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