Yes, if you know how and have some patience.
It's disappointing that the DAP product expert didn't refer you to a product of theirs that Home Depot sells that addresses your need: Platinum Patch 16 oz. Advanced Exterior Spackling Paste It's designed for PVC patching as well as patching on other materials and is tough enough to be used on exterior applications as well. I would caution against using it to fill butt joints as it will crack over time. For that, please consider the DAP Dynaflex 230 product that Home Depot sells. It is a great product for that purpose.
Thank you for posting your inquiry. As indicated on the product package label and supporting product literature: "One application is usually sufficient for small repairs. For repairs deeper than 1/8”, apply two or more layers allowing spackling to dry between applications. Spackling will change color to white when surface can accept a second application or is ready to be painted or sanded in 1 to 5 hours." (longer in cool or humid conditions). Should you have any questions or require further assistance, please contact DAP’s Technical Customer Service Department at 888-327-8477.
Hello Kristin, It sounds like you are doing a good project and it has been a while since we used this product. As I recall, the spackling paste appeared pink and dried nicely to white. Yes, the compound was not soft and fluffy. In fact, I used it as a rough sculpting filler in a quick pinch for a small touch-up project. It sounds like your purchase was the right product and you probably just need to give the compound some additional time to dry. Please know that your project would not be completely ruined at any point because there are other options to consider if you do not like the completely dried compound. Consider: a) Tinting your future compound with some paint before applying to achieve the color you desire. Work with the home specialist to figure this one out better. Found this online @ www.Finehomebuilding.com b) Once the compound has dried, you can paint over the compound to achieve the color you desire and have the finished look you planned from the first. Which I believe was a Bob Villa suggestion at one time. There are no closed doors ending projects like this. Just go to your local Home Supply store to speak with the right consultant to figure your best path forward. Best of outcomes on your project!
Test it with a clean scrapper and if it brittle and crumples then it is past it’s prime. I would buy a new container of it to be safe. Don’t want to mess up your project.
A wood filler would be better
Yes I think it would, it does dry white and easy to sand if needed.
I would not recommend it on anything other than drywall.
It is not as hard as regular plaster making sanding easy and drilling without any issues. I would use wall insert anchors for any drywall screw applications.