Looking for some help whilst my partner was at work I started to clear part of the garden due to the weather it's muddy and there are several tubs of clay from a previous mud play session. I tried to get it all into one large vat however ended up mud splattered then tried to mix the mud in the vat with drill and plaster mixer and it went everywhere so instead of finishing the task I thought I would ask my partner to get into her lycra gear and help finish the job so we both end up mud covered but do I tell her what I have in mind or just suprise her advice please

I've learned over the years, even with my wife being a very willing participant in WAM, it is always best to at the very least drop a hint. If the lycra gear you are talking about is something that could be ruined and she's not up for that, you're just inviting problems.

I'll give you an example from my past. My wife and I were attending my brother's wedding years ago and we had a most terrible time of it. My family was pretty drunk, bad food, attitudes from the brides family, you name it. We thought just cutting out early would be best, so we politely excused ourselves, took the cake we were offered in a small box and went to the hotel room. Trying to be funny, I figured we could try our own little "wedding cake feed each other" thing as we were not yet married. When that cake hit her cleavage, she went ballistic and it almost ended the relationship because of how unhappy she was over it.

In general its always better to ask her first.
Granted if you're asking her to help mix up some mud and requesting she wears her Lycra gear while doing it she'll probably put 2 and 2 together. (I'm assuming she's fully on board with your kinks- its a pretty big test of how well you know your partner and what her rules are).

Personally I'll always ask my partner if its something for me (such as getting messy). The only things that are a total surprise for her are things she's specifically said she'd love to do, in which case I'll organise it all in secret and only tell her the dates/time.

Organise it in advance. Remember this is your kink not hers.
If she was to surprise you with your kink last minute of course you be down for it.
But women aren't like that they need to be talked to. Remember real life isn't like porno's or messy videos (roll playing) how we like to see things (fantasies).
Just be grateful she's down for getting messy so don't push your luck.

Co-sign

Even if I do wam in all of relationships I hint and listen first start with water than work my way to other stuff.

Thanks for the advice hopefully if the weather is ok tomorrow I will ask my partner to get her lycraoutfit on then show her my muddy Jeans and ask her if it matters if she ends up as dirty if the answer is yes then the garden clear up can go ahead hopefully