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Priming on top of caulk/filler?

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8 Jul 2025
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I'm redecorating my living room and have applied decorator's caulk to the joints between plaster and coving/architraves/skirtings, many of which had small cracks.

I have also filled a number of small dents/scrrw pops.

I will be painting the walls and ceiling with emulsion (and applying an eggshell finish to the woodwork).

Do I need to worry about the potential for crazing of the paint applied to the caulk? - is it necessary to prime these areas, and if so, with what? And should I spot-prime the areas where I have applied filler? I have some Zinsser BIN-Aqua on my shelf and also some Zinsser Peel Stop, and obviously it would be good to use products that I already have, but I'm not sure if these are suitable for this task, or if it's necessary to use anything at all.
 
Depends on the caulk and type of paint going over.
I prefer not to use caulk unless I really have to and then only a small amount and leaving it a 48h to dry.
Try a bit and see what happens
 
Depends on the caulk and type of paint going over.
I prefer not to use caulk unless I really have to and then only a small amount and leaving it a 48h to dry.
Try a bit and see what happens
I’ve stopped using it to. I use two pack filler wherever possible. It stops cracks in the future.

Caulk is good for sealing tape for a straight edge.
 
I’ve stopped using it to. I use two pack filler wherever possible. It stops cracks in the future.

Caulk is good for sealing tape for a straight edge.

Like @Wayners I am a professional decorator.

I use about 10-15L of 2 pack per year (sometimes more, sometimes less).

It is pretty pants at accommodating movement, eg hairline cracks in between the underside of coving and the wall. It would also be a PITA to sand without damaging the underside of the coving. That said, yes, it can lock things in place, so, yeah, I will a give you a "win" on that.

A great product though when used appropriately.
 
Underside of coving is a problem with cracks.
32mm drywall screw in a red Fischer plug (smooth and hard plastic) every 125mm Ish is best way to squeeze coving tight against wall. Screw will pull in plaster cove easy with a hand screwdriver.
Rake out crack a little but don't damage coving, gardz and fill.
Only way other than replacing coving making sure you seal wall and use a good adhesive.
I've tried everything. Drilling holes and injecting foam. Raking out. Nail gun. Grab mastic. Screws are the best way imo
 
Like @Wayners I am a professional decorator.

I use about 10-15L of 2 pack per year (sometimes more, sometimes less).

It is pretty pants at accommodating movement, eg hairline cracks in between the underside of coving and the wall. It would also be a PITA to sand without damaging the underside of the coving. That said, yes, it can lock things in place, so, yeah, I will a give you a "win" on that.

A great product though when used appropriately.
I’m just a diyer. I’ve used the filler for our Victorian house- skirts don’t fit the wall when replaced so I’ve filled them. Hopefully it won’t crack.

I also like drywall finishing filler for walls and little dents in plaster.

I wasn’t telling anyone how it’s done.

How would you fill a gap between a skirt and the wall please ?
 
I’m just a diyer. I’ve used the filler for our Victorian house- skirts don’t fit the wall when replaced so I’ve filled them. Hopefully it won’t crack.

I also like drywall finishing filler for walls and little dents in plaster.

I wasn’t telling anyone how it’s done.

How would you fill a gap between a skirt and the wall please ?

No offence taken.

With tall Victorian skirtings, I often use two pack filler where the thin edge of the skirting meets the plaster if it has been mullered over the 100+ years.

If I can see any evidence of bounce, I will apply more fixings, or squirt in expanding foam to lock the skirting in place.

Often, the top lip is too rough to use caulk or a ms polymer.
 

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