joe
04-16-2006, 09:11 AM
I've noticed a few posts about paint adhesion problems on substrates. The latest wave of complaints are against Extira. I too, a couple of years ago, had issues with this product. My conclusion, which I have posted to adnosium, was suspicious of the waterproofing oils or whatever they use. As all of you know I began using a epoxy washes which seems to be a good step. However a few weeks ago, under a lot of pressure to get a sample sign out, I quickly coated my Extira with epoxy, primed and top coated with my latex. A couple of days later I attemped to transfer some vinyl letters and the paint lifted in a few spots. At that point my paint theory was breaking down.
Yesterday, Saturday, my good friend Doug Strickland came by to help me with a couple of 4'X10' routed panels. During the day we pulled out the afore mentioned Extira panel and gave it another set of agressive paint adhesion tests. It passed with flying colors. We couldn't get it to peal with anything short of a Sheffied Chisel. The conclusion I've come to is this. Latex has a degrated sticking ability untill it has cured. I'm thinking it sticks better with ever passing day.
One of our very successfull painting techniques is with PVC. We spray a couple of light latex coats. There again when it's fresh, it can be rolled up easily with a fingernail. I've scratch tested the paint on a couple of old PVC letters. They also showed good resistance to abresion and lifting. My current theory: Allow latex to cure down to the base.
Wouldn't it be interesting to know is this is a factor with Extira!
O yes, over the last three weeks I've called and left several messages for a technical person at Extira. They apparently know there's a problems. I not giving up. I'll wear out the phone lines working my way up to the top. I'll keep everyone posted.
J.
www.normansignco.com (http://www.normansignco.com)
Yesterday, Saturday, my good friend Doug Strickland came by to help me with a couple of 4'X10' routed panels. During the day we pulled out the afore mentioned Extira panel and gave it another set of agressive paint adhesion tests. It passed with flying colors. We couldn't get it to peal with anything short of a Sheffied Chisel. The conclusion I've come to is this. Latex has a degrated sticking ability untill it has cured. I'm thinking it sticks better with ever passing day.
One of our very successfull painting techniques is with PVC. We spray a couple of light latex coats. There again when it's fresh, it can be rolled up easily with a fingernail. I've scratch tested the paint on a couple of old PVC letters. They also showed good resistance to abresion and lifting. My current theory: Allow latex to cure down to the base.
Wouldn't it be interesting to know is this is a factor with Extira!
O yes, over the last three weeks I've called and left several messages for a technical person at Extira. They apparently know there's a problems. I not giving up. I'll wear out the phone lines working my way up to the top. I'll keep everyone posted.
J.
www.normansignco.com (http://www.normansignco.com)