zgeezer Posted May 31, 2004 Share Posted May 31, 2004 I've had two unhappy experiences with POR: their "Tie-Coat" product I used over the POR is delaminating in several locations. It takes with it PPG primer, color, and clear and a lot of work. The second product "Top Coat" which I sprayed over cured POR has totally delaminated from suspension parts in 18 months of outdoor storage on the North side of my garage. Parts I had previously painted with a brush using Rustoleum primer and black Krylon rattle can spray and stored with the POR finished items have faded, but have not delaminated and have not shown any rust. I have rust reappearing on metal seams that I had previously painted with POR. As the rust follows the seams, this problem may be a matter of technique and not product. Nevertheless, the body was sandblasted and treated with POR's "Metal Prep? (Ready?)" before being painted, again with a brush, with POR's high solid content "Silver". I took my time and really made an effort to avoid any surface contamination and to work the product into all body seams. The entire tub was treated, inside and outside. The delamination appears to be limited to the outside. I will post photos on my Album on HybridZ so you can see what's happened. This work was done outside in the low California desert: we have a lot of sunlight and heat. Little humidity, which I understand POR needs to set up. One year passed between the application of the POR and the Tie Coat. When the Tie-Coat delamination first appeared, the distributor for the product stated that the separation was due to contamination of the POR surface before application of Tie-Coat. I think Tie Coat will delaminate if it is subject to light and heat (one year outside) for any substantial time before painting it. If any of you have any comments or suggestions, I sure would like to hear them. Right now, I'm eying the old sand blaster and my PPG receipts. g Quote Link to comment Share on other sites More sharing options...
Tim240z Posted May 31, 2004 Share Posted May 31, 2004 Some interesting reading for you: http://www.eastwoodco.com/jump.jsp?itemID=852&itemType=CATEGORY&iMainCat=688&iSubCat=852 http://www.eastwoodco.com/jump.jsp?itemType=CATEGORY&itemID=372&iMainCat=372&iSubCat=372 Quote Link to comment Share on other sites More sharing options...
waynekarnes Posted June 1, 2004 Share Posted June 1, 2004 unfortunately, i had heard the same from the VW/dune buggy sites i visit. most times, it is the prep that caused the problem. not that you didn't do an excellent prep job, just that POR 15 is that sensitive. seems that there is an issue time to time, at seams and overlaps. the POR 15 doesn't flow into small areas, or there is residue left behind from the marine clean or the metal prep. i think that the POR 15 paint stripper should take the POR 15 and tie coat off ... it'll be messy ... http://www.prp-porshop.com/por-15-strippers-solvents.htm i used the POR 15 on my son's baja bug's interior floor ... it had no rust, just wanted to coat it ... i'm gonna spray bed liner over the top of it. on my 240z i used rust bullet ... i had bought the POR 15 before i found out about rust bullet. http://www.itkillsrust.com/phpBB2/forum2.html'>http://www.itkillsrust.com/phpBB2/forum2.html http://www.itkillsrust.com/ http://www.customrodder.com/tech/0309cr_rustinhibitor/ i am not associated with the rust bullet product, other than being a customer. basically ... wire brush the rust, get the loose stuff cleaned up, vacuum the dust up and out of the nooks and crannies ... brush or spray rust bullet on ... plus, the rust bullet doesn't require any special product specific prep products to apply, nor thinning should one want to spray it. if patching small holes ... scrub with wire brush ... coat with rust bullet, lay regular fiberglass mat over the just painted rust bullet. tap it in place with the end of the brush, until saturated, more rust bullet, more mat, repeat until comfortable. it'll harden just like fiberglass and be rust protected and preventive at the same time. good luck with the clean up, and sorry to hear of your problems with the POR 15 ... i feel for you, do all that work, to have it fail ! wayne Quote Link to comment Share on other sites More sharing options...
EvilRufusKay Posted June 2, 2004 Share Posted June 2, 2004 What is it you like better? I am currently using POR and also have mixed feelings. Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted June 2, 2004 Share Posted June 2, 2004 Zero Rust is the product... http://www.zerorust.com/ Do a search for Zero and Rust and you will find a couple of threads here... Quote Link to comment Share on other sites More sharing options...
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