Mike,
I was going to send you a PM but maybe some fellow members may also be interested in the answers to the questions I wish to ask you. I have some 'Hirst' moulds on the way and therefore took
your advise and got some 'Hydrostone' and so I would like to tap into your experience of using the same moulds with the same casting agent. First...what ratio of Hydrostone to water mix did you fine best. Second... what measuring system did you fine that worked best for making the mix. Any suggestions and or tips you may like to offer would be greatly appreciated.
Thanks in advance mate.
Wayne.
Wayne...
honestly...I never once used a measuring ratio and I have cast 1,000's of bricks...^&grin...for real...
almost any consistency will work...but I try to make something like a thin pancake batter...
the thicker it is...the quicker it dries...
the thicker it is...the harder it dries too...
but if it's too thick...you may see air bubbles that couldn't escape...they really look bad too...
Bruce Hirst has a method to eliminate trapped bubbles with an elaborate vibrating table set up...you really don't need that...
before I pour the mold...I spritz it with a water solution and then shake off the excess water...the water solution has a squirt of dishawasher rinse agent in it...you know...the blue stuff...over here it's called "rinse aid"...and it's supposed to help the batter seep into all the cracks...after I pour the mold...I tap if pretty hard with my putty knife which allows the bubbles to rise to the surface and escape...
I use a 12oz plastic cup...a large squirt bottle of water and a wooden tongue depressor to mix it...
some molds are deeper than others and require more batter...but you will get the hang of it after a couple of batches...the tile roof mold is very thin and uses very little Hydrostone...
I try not to waste any...so if I pour a mold and have 1-2 ounces left over...I get another mold and pour some select spots in that mold of bricks that I use frequently...
I do mine over a piece of newspaper...it makes a mess...after 2-3 casts...you will change the newspaper...
it usually takes 15-20 minutes to cure...but a fan on it speeds that up...
I pour my mold...let it sit for 2-3 minutes...the water comes to the top as the Hydrostone settles...then I scrape off the excess...
then wait 15 minutes to check it to make sure it's hard before taking out...
Wayne...I have seen the quality of your work...you're an accomplished modeler...this will be easy for you...you will be in expert after 6 casts...you will be amazed how your pile of bricks grows so quickly...
one last tip...
get some quality plastic baggies...make sure to label them with the molds #...with a marker...
ex: #70...#250...etc...
put all finished pieces of each finished cast into to that bag so you can find them easily when you want them...once they get mixed up...it's difficult to sort them out...
you will thank me for that tip later...^&grin
dying to see your work...they are addictive...good luck...
my favorite mold right now is #75...the "ruined fieldstone mold"...it works so good for exposed damaged brick...look at some of the "collapsed roof buildings I did...that is a nice mold...