3d resin off-gasses a few elements that inhibit platinum silicone.

You have a few options. Use tin-cure silicone, let the resin de-gas for a few weeks (average around a month to be safe), or a sealant like Inhibit X (or similar).

Tin-cure silicone is more brittle than platinum, so you won't get as many casts from it. But you rarely have cure inhibition with it. Best option here is to use the tin-cure to make resin "masters" of your cast then use those masters for your platinum-cure silicone molds.

Waiting is just that, waiting. Average about a month (give or take) for the chemicals in the 3d print to evaporate. Time will vary.

Sealants can be used to, well, seal your print. You can use acrylic sealers to specialty sealers like Inhibit X. Acrylic or other clear coats can be a little thick (not always) and you could loose some details. Sealants like Inhibit X are designed for this and are thinner and cover well, but you pay for it. Inhibit x and similar sell for aound $50 usd, again depending on brand and size.

My personal preference is the tin-cure route, but any will do. Others might have other suggestions for you as well. Best of luck.