I have a long one inch wide line of Great Stuff Foam (Red Can) that is to become part of my exterior “trim.” I know that is cutting corners, but it’s what I did. It’s high and out of sight. It fills a very irregular gap where a large moulding board meets another. I first epoxied the moulding, which had had some rot.
Can I use the oil primer that I have been using?
Edited 6/25/2005 8:39 pm ET by Cleveland_Ed
Replies
I gotta bump this
OOPS, I did it again.............................
Maybe skim coat with a quality paintable caulk.
I'm sorry, I thought you wanted it done the right way.
OK, so the foam itself isn't very paintable. Need another layer of something on which to apply the paint.
Fypon. We've all seen this stuff, or at least heard of it.
Here's a pic of a corbel from the Fypon site.
View Image
It is certainly paintable, used extensively in exterior applications, and it is made of urethane foam. Of course, the surfaces you paint are molded, not cut.
I would think if you foam up a void, then trim it off flush, and surface the trimmed face with paintable exterior latex caulk, you will get OK results.
Gene Davis, Davis Housewrights, Inc., Lake Placid, NY
Possibly.
I was thinking of the same comparisson, but it is not equal, only similar.First, I'm not sure that the dow product is a polyurethene or something else close. But also, the insulating can foams have a lot more propellant and expanding agent on the product than the Fypon does, creating the larger voids and resulting in far less density.The way Fypon does theres is to spray a latex ( pretty sure they said it is Ben Moore) primer into the mold. This acts as a slip release agent but5 also ends up well adhered to the foam. The foam then fills the form which is clamped shut while it spends however many minutes are required to cure up. Then after it is kicked out of the oven and dumped out of the form, a person shaves the hangers off at the clamp seam, sands a bit if neccessary amd it gets another coat of primer sprayed one while it is still warm.Since polyurethene is a moisture cure, the latex paint adheres very well to it, and probably kick the cure off to a good start.Since it is sensitive to UV degradation, it is important thatthe paint be enough to shield the product from all sunlight. I asked them how to repair chips and other damage for painting and they said that bondo was what they used, or that Minwax wood filler wood be fine. So for this subject at hand, I would vote for a bondo top coat to solidify the surface exposed, and then paint it.
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Today I cut back the foam so there is now a recessed area. I'll fill it with one of the suggested products from this thread.
Thanks. Without the feedback I would have simply experimented with different primers and had problems later.