Flexbond from Rosco: the ultimate primer for thermoplastics and EVA-foam.
Flexbond is a quick drying, water soluble primer, it is non-toxic. This flexible primer is perfect for priming Worbla. Can be applied with brush or sponge. If need be, add a few drops of water for liquidity. Three layers for perfect finish, half an hour in between layers. Leave overnight to fully dry out before painting.
It is easy to clean with water and soap.
Product description from Rosco:
Rosco FlexBond provides a flexible adhesive bond between many scenic materials, such as fabrics, plastics, foams and wood. It dries to a clear, hard, yet pliable coating that does not suffer from the « tackiness » common in many other flexible glues even after those glues have had days to dry. And unlike ordinary « white » glues which can crack and break when flexed, the adhesive bond of Rosco FlexBond remains extremely pliable and strong even as the materials bend and deform. Rosco FlexBond is water- based with little fume.
Suggested Use: Use FlexBond to adhere fabrics to fabrics, fabrics to wood, foam to wood or fabric and many other combinations of materials common in scene shops. Rosco FlexBond provides an excellent coating over Ethafoam™ that allows this notoriously difficult foam to be painted with ease. With its super adhesion, Rosco FlexBond can be used to laminate blocks of foam together. It can be thinned with water, tinted with colorants or Rosco Paints, or used as an additive to give other coatings like plaster or clay added flexibility.
Application: Apply by brush, roller, or spray gun.
Surface Preparation: Surfaces should be clean, dry and free of dirt and grease. When applying this primer to vinyls or plastics, clean your surface with denatured alcohol to remove any excess plasticiser that might interfere with proper bonding.
Compatibility: FlexBond is compatible with most water-based coatings and is easily painted or tinted. Tint FlexBond using Supersaturated Roscopaint, Off Broadway, latex paint, or colorants. Add the primer to other water-based coatings as an additive to increase flexibility and adhesion.
Mixing: Stir before using. Do not shake as bubbles may develop.
Dilution: Use FlexBond undiluted on most non-porous and porous surfaces. It may be diluted with water if desired. Thinner mixtures will flow and level more than an undiluted application and will dry to a thinner coating.
Color: Off-white, matte finish.
Coverage: Approximately 250 sq. ft. per gallon (23 sq. m. per 3.79L).
Film Thickness: Undiluted 1 mil dry film.
Dry Time: Varies with application. Sets in 30-45 minutes. Full cure within 7 days.
Clean-Up: Soap and water.
Shelf Life: Minimum 24 months.
CAUTIONS: Do not apply when surface or air temperature is below 50°F (10°C). Protect against freezing. Avoid prolonged contact with skin or breathing of spray. Do not take internally. Use with adequate ventilation. KEEP OUT OF REACH OF CHILDREN.
Check out this review from « …And Sewing Is Half the Battle! »: http://andsewingishalfthebattle.com/product-review-flexbond