what happens if, page-2

"If you did not accept the offer but the bidder managed to get at least 90 per cent of the class of shares for which they were bidding, the bidder may (and usually does) send you a notice that it wants to acquire your shares compulsorily. This means that your shares will be bought by the bidder on the same terms as were offered to the shareholders who accepted the offer, even if you do not want to sell.

If you did not accept the offer and the bidder did not get 90% of the shares, you are still a shareholder. You can sell your shares on the stock market if you wish. However, the bidder may now be in control of the company and can influence dividend policy, possibly by reducing the dividends paid out, or it may seek to have the company delisted. Look at the bidder's statement to see what the bidder said it would do with your company in such circumstances.

Later, you may find that the majority shareholder will come along and offer to buy you out, perhaps at what you may consider to be an attractive price. On the other hand, they may decide to do nothing and your shares may drop back below the original offer price, or even lower because there is no prospect of a rival bid.

If the holders of 10% or more of the minority object to the compulsory acquisition, the matter may go to court to determine the fair price."

QGC have suggested previously they will seek to delist RPM if they do not get 90%.The current ssp is a ploy to get them closer to 90% but it still may not get them to the required amount.
http://www.fido.gov.au/fTido/fido.nsf/byheadline/Takeovers+info+for+shareholders?openDocument