I am looking at using flexible brick mold to trim out some window exteriors. Trying to match an existing situation. The building will be stuccoed. Anyone have experience with this stuff?
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I've used Azek for that application (long radius on a bow topped window). With Azek, you need to warm it (I stood it up over a heat register for 30 minutes or so) and pull it into the curve gently. Keep your nails inboard of the tension side as much as you dare or the moulding may fracture.
I've used flexable moulding I think three times: crown once, baseboard once and a brickmould once to trim an eliptical fire place. They were all interior applications. All but one, the fireplace, called for a transition from the flex moulding to conventional moulding and the profile of the flex moulding was bigger in both cases making for some ugly work. Other than that watch your reveal an use common sense and you should have no problems. The last time I used it was abou three years ago maybe the profile has got a little better.
I have used flex-mold indoors only but let me say this...keep a collection of compounds and sandpaper handy. It seems that flex is cast, so each piece is different from the next and it rarely matches milled wood or Azek trim. Use deck adhesive in the joints and behind the mold then nail with 18 gauge. Go 16 if you must but try clamps, cauls and screwed battens as well. When blending pieces sand as needed then try bondo or somesuch. You may have to do some "sculpting" at the transitions and joints. Your first run may take all day but subsequent pieces will go quicker once you get a feel. Flex crown is like hanging a P.O.'ed anaconda but gives an impressive result when finished, unless it is prefinished stain-grade like the two dozen plus lengths we just put up...that'll keep you up nights...