Does it stick well on OSB?

Hello Mike, Thank you for your question. Our Winterguard does stick directly to the OSB and it is very adhesive. WinterGuard® waterproofing shingle underlayment is a composite of asphalt polymers, ensuring vapor-tightness and elasticity. It seals around nails and is part of the CertainTeed Integrity Roof System®, delivering top-notch performance. Performance The asphalt makes it vapor-tight, and the polymers make the asphalt elastic and sticky. This protective barrier is able to stretch and seal around nails driven through it. Protection The key components in the CertainTeed Integrity Roof System® which is comprised of underlayment's, shingles, accessory products and ventilation all working together. Warranty WinterGuard is warranted against manufacturing defects and to remain watertight for the same period as the warranty duration carried by the shingles applied above it -- up to a maximum of 50 years. Here is the link for installation instructions - https://certainteed.widen.net/content/juxc8zri9t/pdf/20-30-202-Underlayment-Chapter.pdf?u=nwk4fd Thank you, CertainTeed