|
Crocodile and Sticking are both signs of a contaminate on the Mold surface. It may have looked great but the ultimate test is the 'clean release'.
Sime prepping a mold is a time expensive laborious job. But attention paid here is most rewarding later so don't rush it and every time you think that will do it probably won't.
One must do the hard yards to avoid the problems you've encountered.
Step one) If the Moud hasn't got a perfect and I do mean perfect unflawed finish use PVA. If it has, apply 5 coats of wax, allow it to set up as in dry (follow the manufacturers directions to the letter and beyond) waiting at least a couple of hours between coats in Summer and up to a couple of good weather days during the cooler months but not Winter. Moisture and Humidity is a problem during the colder months. Use brand new straight from the pack Microfibre Cloths for off cloths. Here's the thing, you can only use them once then throw them in the Engine Dipstick checking pile.
Wash the Mold with Acetone before Waxing and wait a few days before Waxing. Chemically clean can only be achieved with Acetone. Thinners won't do. Also you must wear Disposable Gloves. Never touch the Mold with bare skin. Have to move the Molding. Put Disposable Gloves on. Picking up the Mold Cover, put Gloves on before touching the Cover.
Five Coats is the minimum. Not using the Mold for a while or a few hours cover it with a brand new lite weight Shower Curtain. Peg or tape the the over hanging bits so no dust etc can get in but don't let the Cover touch the Mold. You want the Mold to still be able to breathe. Wait a week or two before use.
Between Lay Ups add a couple of coats of wax just for the luxury of it.
Bloomin Heck! I hear you say, that's excessive! But no, it's not.
Silicone is a common Contaminant. The best way to get rid of Silicone or suspicion of it is with Steam. Yep Steam. You can Acid wash your Concrete Floor a day or so later too, just to kill or get rid of everything else. So Hire a Karcher or the like that sprays really really hot water, squeegee the water out and come back in a week to start the Mold Repairs......
Now it's time to start the repairs to your Molding. Wear Gloves and Long Sleeved Clothing at all times. Don't go leaning on the Mold doing the Repairs. If you get tired, cover the Mold then stop and rest away from the Mold. Cleanliness is Godliness.
Silicone's are a Glasser's nightmare and you have some on your Mold.
|