Spackle on a fireplace or do I have to use plaster?

[Grillen]

I have a fireplace in the living room that is bricked and then painted white. Now I want to fill in the brick joints and also smooth out the surface and paint it white again. I have a lot of "regular" fine-grained filler at home and am wondering if I can use it? Or will it not work well given the potential heat if I use the fireplace? Another reason is that I find filler more manageable than, for example, plaster and similar, so naturally, I would prefer to use this if possible.

Any expert who can give an opinion?

 

[Roundup]

I am no expert, but I have experience from having my own fireplace remodeled. I would have avoided using spackel and instead used gipsputs, which is somewhat similar to spackel in handling but likely has better heat resistance (I have personally gotten some hairline cracks in the gipsputs where it is hottest above the stove insert). Additionally, I would put up wire mesh to reduce the risk of larger cracks.

 

[AndersS]

I could imagine that the classic Husfix or equivalent would fit well here.
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