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Discuss Patchy Mapei grout... any ideas? in the UK Tiling Forum area at TilersForums.com.
aggree with Andrew. i use mapei grout all the time. some times if you get too much water on grout, it washes colour pigment away ( very important to feed grout with water evenly)
Sorry I failed to notice you didnt use a paddle, mapei grout is less forgiving than other brands but I believe that's due to a more complex formulation, hence more thorough mixing required!
What sort of temperature is the room at?
Excessive surface water when washing can cause discolouration
dry adhesive residue in the joints even when scraped clean, if not even can cause the same problem as it draws moisture from the grout unevenly!
I could go on with a long list of maybes ,
has it improved at all since yesterday?
Have you tried a hair dryer on a small patch of the dark, just to see if it is a moisture issue?
The instructions on the 5kg bags of Mapei UCP does state 5kg per 1 litre of water,but it does go on to state(can't remember the words exactly) but words to the effect that different colours need different amounts of water!BAL Micromax, super flex and microflex, basically BAL. I have always used BAL and on the few occasions I've used ultra colour I've had issues, either setting too quickly, drying patchy etc, I also don't like the fact that it needs to be mixed a whole 5kg bag to exactly 1 litre of water, to me that suggests that it's too sensitive. I've read too many posts on here with it going wrong from DIY and pro's. I know a lot of folks on here love it so it must be a decent product, but not for me.
A standard grout will have less components, specifically formulated colours are more complex in there make up! You need to mix the whole bag in order to get the consistency spot on! The better the quality of product the more time and care required to optimise it!
Sorry mate I M O this is the problem was it a 5kg bag?
What about Tile Giant
TILE GIANT
UNIT 1
ATTERCLIFFE TRADE CENTRE
SURBITON STREET, SHEFFIELD
S9 2DN
Ok just trying to help.
i use jasmine all the time,seems to be the colour of the moment around here. don't think ive ever mixed a full bag,if i run out i mix a bit more,no problem,never measure the water either,just turn tap,stop tap,pour in,mix with bucket trowel,leave for a few mins,mix again and im off.
id just leave if for a while,you could have a thicker bed of addy in some places,just takes longer to dry.
did you use grey or white addy?
I used grey.. i didn't think it would be a problem when using grey tiles and grey grout... I back buttered all the tiles so i didn't get any shadowing and made sure all the voids were clear. I also left it 3 days to dry out.
I spoke to the Mapei rep & he told me Ultracolour plus "Must" be mixed with the exact amount of water stated & "Must" be mixed mechanically.
I used Ultracolour plus at the tail end of last year & just stuck in enough water to do the job, disaster.
I then used it again on a job 3 weeks ago & it was perfect as i followed instructions to the letter.
Reply to Patchy Mapei grout... any ideas? in the UK Tiling Forum area at TilersForums.com
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