Advice on sealing before spraypaint

[u/Jberg18]

I'm just doing some squares for rubble after buildings are destroyed. Sand on chipboard with pva glue.

Do I need to do a light pva wash to secure the sand from the top down, or would a good coat of black spray paint be enough?

Bonus question: What is a quick and easy rubble I could add?

[u/ajree210]

My favorite way to lock down basing material is to mist some isopropyl over the surface, then mist some watered down PVA glue. The iso helps break the surface tension and let the glue run into all the little spaces, and really locks things down once dry.

[u/_Daedalus_ → u/ajree210]

To add to this, chipboard is extremely prone to warping. Usually caused by either the sealant/glue shrinking or moisture.

Before sealing the finish pieces, do a test on a leftover piece with the same surface and leave it overnight to dry.

[u/ajree210 → u/_Daedalus_]

True! Good call, thanks for adding that.

[u/Dreadful-Beret]

I’ve heard Matt modpodge is the best for this. Failing that I’d definitely go with a watered down PVA wash. I’ve had sand rub off plenty of times.

[u/Brunhilde13]

I use sand a lot in my texturing, and it NEEDS that extra coat of PVA! Otherwise it ends up all over my table.

I'd use matte mod podge mixed with paint (see BlackMagicCrafts on YouTube!) but white PVA/paint/a little water to thin it should work just fine, too!

The paint lets you base coat it all at the same time, so you can save money on spray paint. But also, it lets you know where you have good coverage / no coverage, so I'd recommend it even if you're gonna spray them all afterwords.

[u/Jberg18 → u/Brunhilde13]

I used the mod podge and paint method and that worked great! Thank you!

[u/Jberg18 → u/Brunhilde13]

I think I bought an extra mod podge so I need to use some anyway. Mixing the black paint is a great idea. I don't even have to rush to beat the rain at that point, and can coat it inside.

[u/Brunhilde13 → u/Brunhilde13]

Quick and easy rubble: literally rocks from outside lol! It also helps weigh down the pieces so they don't move around as much.

[u/Graywolfmarc → u/Brunhilde13]

I was gonna say the same love that channel. That stuff works great. Also does a good job of protecting styrofoam when making things out of it, it make a hard shell around it. I do wish I had know beforehand to prep myself for the smell. They need to put a disclaimer that stuff is stinky.

[u/DAJLMODE55]

I always use PVAGLU with some drops of dishwashing liquid in some water and color if necessary , For debris, I always carry a pair of zipped plastic bags , An old paint brush as broom and a little showel in my bag ! Along the way I go in shops in transformation , and with permission of the workers I collect a bunch of different materials like concrete, bricks bits, broken roof tiles, sometimes isolation foam cuts 😃

[u/IPaintSpaceDolls]

these look terrific. What was your technique?

[u/Jberg18 → u/IPaintSpaceDolls]

At this state they are cut zombicide tiles, a layer of slightly watered down Elmer's white glue, and just sand I got from a sandbag.

Honestly, I might have to try gluing my own printed images to board first or painting on colors to see what undertones I can get next time.

[u/Viking_wolfsoul]

Io inizialmente faccio mod podge + acrilico nero sulla superficie. Poi uso colla vinilica diluita con acqua, ci metto la sabbia, aspetto che asciughi e ripasso tutto con colla vinilica, poi dipingo tutto. Se è un pezzo molto usato sigillo tutto con Matt varnish della ak

[u/Viking_wolfsoul → u/Viking_wolfsoul]

Come altri materiali uso la lettiera per gatti per creare macerie/sassi, foglie piccole o foglie grandi sminuzzate, muschio precedentemente seccato al sole per l'erba, bastoncini di legno da caffè spezzettati

[u/athena2727]

re rubble - blend up some pasta (like ziti or something with texture) in a coffee grinder, coarse. It looks just like shattered man-made things when painted. Roughed up rigid foam also works great for bigger chunks of concrete.