exterior self-levelling compound - how to get rid of pour lines

Rsc72

I have used Setcrete Exterior self-levelling compound to create a flat surface for tiling my front path from street to front door. It went well but there are some pour lines left over and one or two bumps.

What is the best way to get rid of these? Should I do another very thing layer of compound on top? Should that additional layer be over the whole path or targeted just to the lines?

 Alternatively, can the lines be sanded down?

grumpy_codger

I wouldn't say that it 'went well'...
Who is going to do tiling? Ask them if this imperfectness is acceptable. If not, I think you have to grind it  - either with a usual angle grinder or with the same grinder with a segmented diamond cup, e.g. https://www.screwfix.com/p/marcrist-hu350-multi-material-diamond-grinding-head-115mm-4-1-2-x-22-2mm/261ph

MyRealNameToo

(Removed by Forum Team)

Speak to your tiler on if the issues are too big or can be dealt with by them. Ultimately your choice if you repour or grind if they say they need fixing but clearly the previous pours haven't gone very well so I'd be tempted to grind it down rather than add more height which may be equally poor results. 

FreeBear

Rsc72 said:

I have used Setcrete Exterior self-levelling compound to create a flat surface for tiling my front path from street to front door. It went well but there are some pour lines left over and one or two bumps.

What is the best way to get rid of these? Should I do another very thing layer of compound on top? Should that additional layer be over the whole path or targeted just to the lines?

 Alternatively, can the lines be sanded down?

The lines would have been much easier to remove whilst the SLC was setting. But now that it is fully cured, a diamond cup wheel would be best. But before you start, pour lines and minor bumps can be accommodated when mortar is put down for the tiles. Your tiler should be able to advise as to what is acceptable.

If you do grind defects back, please remember to wear googles and a decent well fitting dust mask.