posted
wont stick never use latex over oil of you want adhesion
-------------------- Preston McCall 112 Rim Road Santa Fe, New Mexico 87501 text: 5056607370 Posts: 1552 | From: Santa Fe, New Mexico | Registered: Nov 1998
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posted
Not to be argumentative, but I use acrylics over oil-based primers regularly with no adhesive issues. I've never used boiled linseed oil before though .....
-------------------- Rodger MacMunn T.R. MacMunn & Sons C.P.207, Sharbot Lake, ON 613-279-1230 trmac@frontenac.net Posts: 472 | From: Sharbot Lake, Ontario | Registered: Nov 2003
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Making the simple complicated is commonplace; making the complicated simple, awesomely simple, that's creativity. — Charles Mingus Posts: 6713 | From: Mendocino, CA. USA | Registered: Nov 1998
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posted
Well, just for *hits & giggles I tried a sample with Porter Acrishield satin over the boiled linseed oil. I put it on just a day after the oil was applied. 3 days later, I laid a strip of Gorilla Tape across it & yanked it off. Everything stayed put. Then I cut it 4 ways with an X-acto.... used 3M green tape & it still stuck. Not sure just how well it would hold up if exposed to the weather. I probably should use 1- shot anyway, although I hate the stuff ( instant headache)
-------------------- Rodger MacMunn T.R. MacMunn & Sons C.P.207, Sharbot Lake, ON 613-279-1230 trmac@frontenac.net Posts: 472 | From: Sharbot Lake, Ontario | Registered: Nov 2003
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Generally speaking, oil enamels are not the best choice for wood for two reasons. Oil based paints tend to seal the wood, like a hard shell. If sufficient moisture is in the wood it will force its way out during temperature changes, creating blisters. Water based acrylics are somewhat porous by comparison, allowing moisture to escape. Secondly, acrylic latex is kind of stretchy. It will move with the wood as the grain opens and closes during weather changes. Oil based enamels, with no give, just crack.
True, your wood has been painted with boiled oil, which might normally be a problem. But in the limited experience I have had with linseed oil it seems to penetrate the wood, instead of sitting on top like a shell.
You have done a thorough tape test in my opinion. And only a day after using the oil, when it would probably be the most problematic. I still respect conventional wisdom about using latex over oil, but modern acrylic latexes are very advanced. I think, in your case, the acrylic will outlast the oil.
Brad in Kansas City
-------------------- Brad Ferguson See More Signs 7931 Wornall Rd Kansas City, MO 64111 signbrad@yahoo.com 816-739-7316 Posts: 1230 | From: Kansas City, MO, USA | Registered: Nov 1998
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posted
Thanks Brad. I actually trust Porter or MF acrylics to adhere better than oil-based enamels anyway, so I went with my gut feeling. Obviously you can't really letter a truck with waterbased paints, but this sign is unlikely to get the weather a vehicle would. Yes, the boiled linseed oil penetrated the wood & was very dry within 2 days.
For the record, the linseed oil seemed to accelerate the drying of the acrylic. I painted my main copy through a mask without a bleed coat, & when I pulled the mask off 30 minutes later, a spit-soaked Q-tip wouldn't touch the bleeds. I find I usually can clean up stuff like that easily for an hour or more.
This was on very dry hemlock .... possibly 100 years old, so that may have contributed to how dry the oil got & how quickly it did so.
-------------------- Rodger MacMunn T.R. MacMunn & Sons C.P.207, Sharbot Lake, ON 613-279-1230 trmac@frontenac.net Posts: 472 | From: Sharbot Lake, Ontario | Registered: Nov 2003
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