Paint has cracked.

[5oysterman2]

Morning peep's. I painted inside of concrete door step earlier in the week & there is a gully in it & the paint wouldn't dry.

I used zinser cover stain first & then a coat of Dulux water based emulsion(was that ok)

I googled some answers & one i found was to use a fan. I used it in the hallway for about 2 hrs, the paint has dried but it has cracked in places.

Did i use the fan for too long or wrong combination of paint or something else?
Cheers for any replies

 

[opps]

Did you use a fan or a fan heater?

 

[5oysterman2]

Did you use a fan or a fan heater?

Fan

 

[sparkwright]

Was it water-based zinseer, or oil-based?

Water-based more prone to cracking.

Any unpaintable sealant been used in the past?

 

[5oysterman2]

Was it water-based zinseer, or oil-based?

Water-based more prone to cracking.

Any unpaintable sealant been used in the past?

Oil based Zinser. No idea about what type of sealant.

 

[sparkwright]

Oil based Zinser. No idea about what type of sealant.

Is there a joint or gap that has been filled with a silicone/sealant?

 

[5oysterman2]

Is there a joint or gap that has been filled with a silicone/sealant?

Only where a new door was fitted approximately 4 years ago

 

[sparkwright]

Only where a new door was fitted approximately 4 years ago

And is it only cracking there, or other places?

 

[5oysterman2]

And is it only cracking there, or other places?

Probably hard to see in the photo, but there is a gully there. That's where the paint is cracking & nowhere else. The sealant around the door i painted is okay.