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suobs 04-04-2014 05:58 AM

sealant for Hardieplank
Can anyone recommend a paintable sealant (by brand name) for the end edges where Hardie lap siding butts against wood? Problem with OSI Quad is it takes 7 days to cure. I need something that will be ready to paint within at most a 5 day lift rental.

Frankly I'm having trouble translating this into what to buy:

  • For best results use an Elastomeric Joint Sealant complying with ASTM C920 Grade NS, Class 25 or higher or a Latex Joint Sealant complying with ASTM C834. Caulking/Sealant must be applied in accordance with the caulking/sealant manufacturer’s written instructions or ASTM C1193.

beachguy005 04-04-2014 06:47 AM

Get a good quality painters caulk.

Technical Bulletin
2400 Boston Street, Suite 200, Baltimore, Maryland 21224
Phone: 410-675-2100 or 800-543-3840
Revised: 10/27/10
Painter’s Acrylic Latex Caulk



Easy Water Clean-Up

Indoor/Outdoor Use
10.1 fl. oz. (300 mL) cartridge
Brilliant White
UPC Number:
7079818609, 7079818618,
7079818670, 7079873630, 7079811540, 7079811542
Company Identification:
DAP Products Inc., 2400 Boston St., Ste. 200, Baltimore, Maryland 21224
Usage Information: Call 1-888-DAP-TIPS or visit & click on "Ask the Expert"
Order Information: 800-327-3339
Fax Number: 410-534-2650
Product Description:
Painter’s Acrylic Latex Caulk
ensures a durable seal to prevent air and moisture from passing
through cracks and joints. It applies smoothly and easily and resists cracking and chalking. ALEX
Painter’s is
paintable with latex and oil based paints and can be used for both interior and exterior applications. It cleans up
easily with water, is low in odor and has a low VOC content.
Suggested Uses:
Ideal for caulking and sealing:

Window and door frames




Corner joints
Adheres to:





Painted surfaces

Most common building materials
Performance Characteristics:

Meets the performance requirements of ASTM C834 standard specification for latex sealants, grade
0°C, for extrudability, artificial weathering, extension-recovery, slump and tack-free time.

Resists cracking and chalking.

Tack-free in 30 minutes.

CallMeVilla 04-04-2014 08:43 AM

Beachguy's recommendation is very practical. I would suggest a higher grade version which is elastomeric and cures overnight:

DAP Dynaflex 230 (comes in colors) GooglePLA-_-Adhesives,%20Sealants%20and%20Tape-_-Caulks-_-2KVG2&ci_src=17588969&ci_sku=2KVG2&ef_id=Uz69tgAAB UPdu77H:20140404144122:s

suobs 04-04-2014 11:18 AM

Yes and I just noticed I pasted paraphrased caulk specs. Hardie's actual statement includes the words "permanently flexible".

Austin 04-04-2014 01:15 PM

CallMeVilla 04-04-2014 06:08 PM


Originally Posted by suobs (Post 102967)
Yes and I just noticed I pasted paraphrased caulk specs. Hardie's actual statement includes the words "permanently flexible".

Hence the term "elastomeric" ...

suobs 04-04-2014 06:47 PM

Thanks for the help all. Much appreciated. The DAP Dynaflex 230 is readily available at Home Depot and looks like the perfect solution.

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