dust on concrete ( quick answer needed please )

[davebates]

hi guys so im doing a concrete conservatory floor, i primed with acrylic primer before layer half the room with slc (mapei) because it ran down quite bad i did that yesterday come to the job today ready to tile then kicked over a bucket of dust and bits of general rubbish its mainly brick and concrete dudt ive cleaned up but everything has a coating of dust on from the sweeping ive have hoovered it question is would you prime again ???? because of the dust


many many many thanks !!!!!!

dave

[davebates]

ps can i go over the slc with it as well

[Stewart]

If you've used a quality primer or sbr then you should be able to use a damp sponge to remove dust and allow to dry before commencing the tiling......

[Stewart]

you can prime the slc too, if that's what your asking...

[davebates]

ok i might play it safe and do the lot again cheers

[Brinkley]

imo dave prime again makes sense

[Stewart]

Just remember, if you have primed the floor properly in the first place, an excessive build up of primer can be just as bad as no primer at all....

[Ajax123]

Get rid of the dust before you do anything. You cannot prime dust unless that dust is firmly fixed to the substrate which it wont be because it lies on top of the existing primer. If you do it will simply peel off of the floor and cause a failure.

The damp sponge idea works for me. Sponge up what you can and then leave to dry. Then vacuum up anything loose and then reprime........hope this helps