PVA Mould Release Agent

PVA (Poly Vinyl Alcohol, not be confused with Poly Vinyl Acetate wood glue) mould release agent can be wiped, sponged or sprayed on to a wide range of pattern and mould surfaces to provide a very compatible and reliable release barrier for polyester, vinyl ester and epoxy composites.

PVA is often the first-choice release agent whenever there is increased risk of a mould sticking to a pattern or a part sticking to a mould such as when using patterns or moulds for the first few releases or when using potentially incompatible resin systems for the mould and the part (using polyester moulds to make epoxy parts for example.

Further Informations

Application Instructions

If applied properly PVA is very unlikely to fail as a release agent although whether applied by rag or sprayed onto a mould surface it will always leave a slight texture to the finished part which will need to be polished away. For this reason, PVA is often only used for the first few releases or when release problems are more likely. A mould that has done a few releases and is made out of a suitable material for the parts you will be making can then be changed over to mould release wax which can be polished to leave a mirror finish on released parts (which PVA cannot).

First, ensure the mould surface is suitably sealed (porous surfaces such as wood or plaster must be sealed before they can be used as a pattern or mould), clean and free from any contaminants.

Using a clean lint-free cloth apply a reasonable amount of PVA Mould Release Agent to an area of the rag. The cloth should be well wetted by the PVA in this area.

Wipe the rag over the surface of the mould in a smooth deliberate motion. The PVA has a dark blue die to help you to see where you have been. Ensure you coat the whole surface of the mould with a thin blue film, paying particularly attention to tight corners.

PVA is only ever applied in a single coat. Do not attempt to apply a second coat as this will simply remove the first coat as you try to apply the second coat and result in a more uneven surface.

Allow the PVA to dry fully (around 15mins) before you begin laminating.

When re-using a mould you should remove any traces of the PVA using water and clean thoroughly before re-applying PVA.

Release of a mould can be assisted using water which will dissolve the PVA and help the mould or part to be released.

Downloads (2)

This is a chemical product. Before storage or use you must download and read the accompanying safety and technical datasheets.

	Safety Datasheet (SDS)	628 KB
	Dutch Safety DataSheet (SDS)	589 KB

Specification

General Properties

Gross Weight	0.246	kg

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It's almost impossible to get a perfect finish from PVA release agent. You can improve the finish by spraying it which will result in a smoother finish but it will still be quite matte or satin in appearance. If you want a really glossy finish on your moulds then you'll need to use Number 8 Mould Release Wax or Easy-Lease Chemical Release Agent.

Yes, do people sometimes do this. If you're going to try then the sequence is wax then PVA, however, what you're likely to find is that the PVA 'fish-eyes' away from the wax so much that it's almost impossible to get any kind of a coating of PVA onto a waxed surface. You normally just end up with a few patches of PVA in some corners and then streaks/beads of it in lines where the wax has repelled it. If this doesn't happen then that's usually a good indication that you didn't do a very good job of applying the wax!

Providing you're using suitable materials for your patterns and/or moulds then it shouldn't ever be necessary to use both wax and PVA, just one (most often wax) applied correctly, will be sufficient.

The blue residue left on the part (or mould) from using PVA can be easily and quickly cleaned off by washing the item using warm water.

PVA can certainly be used on its own, in fact it's probably most common to use PVA on its own (without wax). Remember, with PVA, you should apply one single, full application - you can't apply more than one layer because the next application will often try to remove the previous one.

We would not recommend diluting PVA mould release agent as it will likely lead to a thinner or imperfect layer forming over the mould surface which could ultimately contribute to a part sticking in the mould.

ASK YOUR OWN QUESTION

Shipping Information

Restrictions

This product is classed as dangerous goods for transport.

It can be shipped to all mainland EU countries, Ireland, Balearic Islands, Corsica, Sicily and Sardinia.

Unfortunately, for the time being we are unable to ship dangerous goods to Cyprus, Malta, the Canary Islands, Ceuta, Melilla, Jan Mayan and Svalbard.

For a full information regarding the shipment of dangerous goods, see our delivery information page.

Package Size

There are no package size restrictions or surcharges for this product.