Timeline for Should I prime old exposed plaster before repairing it?
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Sep 15, 2022 at 15:40 | comment | added | George Anderson | @FreeMan I maintain that 60 or 80 grit is fine. You want to give the surface some teeth for the mud to connect with. Any sanding marks will be filled completely with the first coat of mud. | |
| Sep 15, 2022 at 12:11 | comment | added | FreeMan | @GeorgeAnderson 60 or 80 grit? That sounds overly aggressive. Are you sure? (not an expert, asking for a friend ;) | |
| Sep 14, 2022 at 22:08 | comment | added | George Anderson | @RocketManZ Don't over-think this. Just mud it over with a finishing mud, doesn't need to be "hot mud" unless you are in a big hurry. Frankly Ive had some issues with hot mud in the way of setting too fast and cracking. | |
| Sep 14, 2022 at 21:34 | answer | added | DIY75 | timeline score: 1 | |
| Sep 14, 2022 at 20:58 | comment | added | RocketManZ | @Harper-ReinstateMonica, thanks for that extra info as well. So rough it up and mud away, that's the plan. | |
| Sep 14, 2022 at 20:58 | comment | added | RocketManZ | @GeorgeAnderson Thanks for the extra info on grit and all. I'm going to give this a go. I used Easy Sand joint setting hot mud in my own home years back on all my plaster repairs and it bonded fine, but I don't recall finding anything this glass smooth. Would you use easy sand joint compound/hot mud for your first coat in this case to get a good bond? I think I'm going to do hot mud for the 1st fill in coat, then I'll use Plus 3 or an all purpose type of premixed mud for the final fill and feathering stages. | |
| Sep 14, 2022 at 20:51 | comment | added | George Anderson | gotta agree with @Harper-ReinstateMonica it needs to be roughed up. Get Vinny and Guido to "rough it up"! Sorry, couldn't resist. Anyway, some 60 grit or 80 grit on a 1/4 sheet sander should get the job done in no time. I've found that mud sticks to about anything, but roughing it up just a bit will give it some teeth to hang onto. Fix first, plaster, prime and paint later. | |
| Sep 14, 2022 at 20:33 | comment | added | Harper - Reinstate Monica | Well the mud doesn't need primer to attach to the old surface. You only really need primer under paint. I don't like putting primer under anything but paint unless they are similar chemistries. | |
| Sep 14, 2022 at 20:30 | comment | added | RocketManZ | @Harper-ReinstateMonica Great point. So would I sand it to rough it up, then mud it? Or sand and prime, then mud in this case? | |
| Sep 14, 2022 at 20:28 | comment | added | Harper - Reinstate Monica | Well, if the surface is very smooth, you can't expect anything to stick to it, it's like trying to mud or paint a piece of glass. It needs to be roughed up simply so the next layer can engage. | |
| Sep 14, 2022 at 20:05 | history | asked | RocketManZ | CC BY-SA 4.0 |