Smooth-On Mold Making and Casting Materials
Home Technical Info How To Frequently Asked Questions Media Gallery News Find a Distributor Mold Makers Directory
McAfee SECURE sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams
About Us Seminars Tech Support Contact My Account Buy Now Smooth-On Home enews
Material Calculator
and Unit Convertor
Custom Formulating
Newsletter Signup

Get Smooth-On's Greatest Catalog Ever! Click Here
Taking the Mystery Out of How to Make a Concrete Sink Mold

With more and more architectural concrete companies offering various decorative sink lines, we present the following “how-to” guide so you too can make your own. Concrete is an attractive material with a unique quality look and feel. Concrete is a "perfectly imperfect" material, it will vary from piece to piece and that is part of its charm and uniqueness. 

The following step-by-step uses Smooth-On's VytaFlex® 40 mold rubber to achieve perfect concrete sink molds that can handle multiple castings. Just remember that you can make a mold of just about anything so get creative in designing your new sink basin.

 The model: concrete sink basin.

1 - The model: concrete sink basin.
 Sink basin is measured for dimensions. Acrylic coated boards are used to construct the mold box walls, spacer board and two baseboards.

2 - Sink basin is measured for dimensions. Acrylic coated boards are used to construct the mold box walls, spacer board and two baseboards.
 Basin is centered on the acrylic coated board.

3 - Basin is centered on the acrylic coated board.
 A pencil outline is drawn around perimeter of basin.

4 - A pencil outline is drawn around perimeter of basin.
 Use a jigsaw to cut out the
circular pattern. This will be used as a spacer.

5 - Use a jigsaw to cut out the circular pattern. This will be used as a spacer.
 Remove plug.

6 - Remove plug.
 Place sink on baseboard and place spacer on top.

7 - Place sink on baseboard and place spacer on top.
 Mark alignment on baseboard and spacer board.

8 - Mark alignment on baseboard and spacer board.
 Use modeling clay (sulfur free) to create gasket around perimeter of basin.

9 - Use modeling clay (sulfur free) to create gasket around perimeter of basin.
 This will prevent rubber from going underneth model.

10 - This will prevent rubber from going underneth model.
 Placer spacer down over basin.

11 - Placer spacer down over basin.
 Use modeling clay to fill in negative space caused by the spacer.

12 - Use modeling clay to fill in negative space caused by the spacer.
 Glue down acron nuts in corners for registration keys.

13 - Glue down acron nuts in corners for registration keys.
 Place one extra acron to help with alignment.

14 - Place one extra acron to help with alignment.
 Assemble mold box with drywall screws.

15 - Assemble mold box with drywall screws.
 Seal seams with hot melt glue.

16 - Seal seams with hot melt glue.
 Release all surfaces with Universal Mold Release.

17 - Release all surfaces with Universal Mold Release.
 Measure and dispense VytaFlex® 40 mold rubber.

18 - Measure and dispense VytaFlex® 40 mold rubber.
 Mix thoroughly for three minutes, scraping bottom and sides of container.

19 - Mix thoroughly for three minutes, scraping bottom and sides of container.
 Pour VytaFlex® mold rubber 40 slowly over model. DO NOT COVER BOTTOM OF ORIGINAL MODEL. Exposed area will represent pour spout.

20 - Pour VytaFlex® mold rubber 40 slowly over model. DO NOT COVER BOTTOM OF ORIGINAL MODEL. Exposed area will represent pour spout.
 Let VytaFlex® 40 mold rubber cure for 16 hrs. at room temperature  (72°F / 23°C).

21 - Let VytaFlex® 40 mold rubber cure for 16 hrs. at room temperature (72°F / 23°C).
 Use modeling clay to fill in any surface irregularities.

22 - Use modeling clay to fill in any surface irregularities.
 Place reverse baseboard down over cured rubber.

23 - Place reverse baseboard down over cured rubber.
 Secure board with drywall screws.

24 - Secure board with drywall screws.
 Turn over mold box.

25 - Turn over mold box.
 Remove original baseboard to expose model.

26 - Remove original baseboard to expose model.
 Remove spacer board.

27 - Remove spacer board.
 Remove clay gasket and wipe surface clean.

28 - Remove clay gasket and wipe surface clean.
 Fill any screw holes with modeling clay.

29 - Fill any screw holes with modeling clay.
 Hot glue exposed seams.

30 - Hot glue exposed seams.
 Apply Univeral® Mold Release to all surfaces.

31 - Apply Univeral® Mold Release to all surfaces.
 Measure and dispense VytaFlex® 40 mold rubber.

32 - Measure and dispense VytaFlex® 40 mold rubber.
 Mix thoroughly for three minutes, scraping bottom and sides of container.

33 - Mix thoroughly for three minutes, scraping bottom and sides of container.
 Pour VytaFlex® 40 mold rubber over model and existing rubber to create second half of mold.

34 - Pour VytaFlex® 40 mold rubber over model and existing rubber to create second half of mold.
 Let VytaFlex® 40 mold rubber cure for 16 hrs. at room temperature  (72°F / 23°C).

35 - Let VytaFlex® 40 mold rubber cure for 16 hrs. at room temperature (72°F / 23°C).
 Once cured, remove mold box side walls.

36 - Once cured, remove mold box side walls.
 Slowly remove top section of mold.

37 - Slowly remove top section of mold.
 Remove original sink basin.

38 - Remove original sink basin.
 A perfect 2-part mold of the original model.

39 - A perfect 2-part mold of the original model.
 Apply In and Out II® release
agent to all surfaces.

40 - Apply In and Out II® release agent to all surfaces.
 Place mold between boards and secure.

41 - Place mold between boards and secure.
 Place mold on a vibration table and fill with concrete.

42 - Place mold on a vibration table and fill with concrete.
 After concrerte cures for 24 hours, demold casting.

43 - After concrerte cures for 24 hours, demold casting.
 A perfect concrete reproduction of the original.

44 - A perfect concrete reproduction of the original.
 Rubber mold is ready to be cast again.

45 - Rubber mold is ready to be cast again.


Taking The Mystery Out Of Creating A Concrete Sink Mold

Watch more video online at Youtube

                   
Smooth-On, Inc. Copyright © 2011
2000 Saint John Street, Easton PA 18042 | Order Desk: 800.762.0744 | Fax: 610.252.6200 | Tech Help: 800.381.1733 or 484.546.0466

E-Commerce Solutions